Mogok scapolite sits in the shadow of the valley’s rubies and spinels, but serious collectors know it as one of the subtler prizes of the Stone Tract: a mineral that records the same high-grade, volatile-rich marble environment that made Mogok legendary. The best pieces have the quiet elegance of a marble mineral rather than the blatant drama of corundum—glassy prismatic crystals, pale yellow to colorless transparency, lavender and pinkish tones in gem material, and a distinctly Mogok association with white calcite marble, ruby, spinel, diopside, phlogopite, graphite, pyrite, sodalite-hackmanite, and rare borates such as johachidolite.
Photo: Yuan et al., Crystals, MDPI
The geological setting is the key to its appeal. Mogok belongs to the Mogok Metamorphic Belt, a long tract of high-grade metamorphic rocks extending through central Myanmar. In the Mogok area, coarse white marbles are interlayered with gneiss and cut by granitic, syenitic, and pegmatitic bodies. Scapolite is not an accidental accessory here; it is part of the volatile-bearing mineral assemblage of the marbles and calc-silicate rocks, especially where chlorine- and carbonate-bearing fluids moved through the system. In modern analytical work, Mogok scapolite has been characterized as colorless to faintly yellow and transparent, belonging to Cl-rich dipyre, with graphite identified among dark inclusions.
Photo: Yuan et al., Crystals, MDPI
For collectors, Mogok scapolite has two overlapping identities. One is the gem identity: transparent stones, including reddish-purple, pink, violet, and chatoyant cabochon material represented in the GIA’s Edward J. Gübelin Collection. The other is the specimen identity: crystals and intergrowths from marble-rich assemblages, especially pieces with strong locality character—scapolite in white marble with ruby or spinel, scapolite with pyrite in scapolite marble, and fluorescent assemblages from Pein-Pyit and related Mogok localities where scapolite occurs with hackmanite, johachidolite, feldspar, phlogopite, and uranothorianite.
Photo: Wikimedia Commons
A fine Mogok scapolite specimen is not simply a scapolite crystal with a Burmese label. It should show why Mogok matters: marble-hosted context, gemmy luster, crisp prismatic form where preserved, interesting fluorescence, or a mineral association that ties it to the Valley’s complex boron-, chlorine-, sulfur-, and carbonate-bearing metamorphic chemistry. Pieces that preserve this context are far more desirable than anonymous loose pale crystals.
Search for specimens: View all scapolite specimens from Mogok Valley, Myanmar
Mogok is not a single mine locality but a historic gem district centered on Mogok Township in Mandalay Region, with named sublocalities and mining areas spread across the Mogok and Kyatpyin valleys and adjacent hills. Mindat records scapolite at the township level and at numerous more specific Mogok localities, including Baw-lon-gyi, Baw-lon-lay, Thurein-taung, Wet-loo, Kyauk-saung-Kyatpyin, Dan-dagu-taung, Dattaw-taung, Laung-pyit, Ohn-bin-ywe-htwet, Pein-Pyit, Mansin/Thet-kachan, and the Pyant Gyi mine. This matters for collectors because “Mogok” labels vary widely in precision: some specimens carry only the district name, while the best documented pieces tie scapolite to a named mine or hill.
The deposit type is dominantly marble-hosted metamorphic and calc-silicate mineralization, with a strong secondary placer component for the gem trade. The famous byon gravels—old alluvial, lacustrine, and colluvial deposits derived from weathered bedrock and marble residues—are the traditional source of many rubies, spinels, sapphires, and associated gem minerals. Scapolite, however, is best understood as part of the primary metamorphic and metasomatic assemblage: it occurs in marble, scapolite-bearing biotite gneiss, calcareous gneiss, and pyrite–scapolite–diopside marble, and it also appears as inclusions in some Mogok corundum.
The broader geology is a compact but exceptionally complex intersection of coarse calcite marbles, high-grade gneisses, schists, calc-silicate rocks, syenite-charnockite intrusions, granites, pegmatites, and ultramafic rocks. The marbles contain ruby and spinel but also diopside, phlogopite, olivine, scapolite, titanite, garnet, graphite, apatite, and pyrite. Charnockite-syenite bodies and skarns are important in the regional gem system, and the Kabaing granite and related granitic bodies are part of the larger intrusive history. Modern geochronology places major metamorphic and igneous events in a multiphase history tied to the India–Sibumasu collision, with ruby-bearing marble and skarn titanite ages around the early Miocene in some studied samples.
Mining history in Mogok is inseparable from ruby, but scapolite collectors benefit from that long mining tradition. Old sources mention Mogok’s gem wealth for centuries; British-era exploitation began after the annexation of Upper Burma in the late 19th century; mechanized attempts rose and failed; and smaller private workings resumed after the collapse of the Burma Ruby Mines company. Waltham’s account of the ruby mines describes traditional shaft mining, open pits in byon, hand-sieving, hard-rock tunnels following calcite-rich veins, and a district with more than 1,000 mines at the time of his writing. Scapolite specimens reach collectors largely as byproducts of this gem economy, not as the target of dedicated scapolite mining.
Collecting access is therefore indirect. Mogok is a working gem district with restricted, changing access and a commercial structure centered on local mining, gem markets, dealers, and export channels rather than casual field collecting. For foreign collectors, provenance is typically obtained through dealers, old collections, museum documentation, and specimen labels rather than personal collecting. The most useful labels include the sublocality, mine name if known, association, date or find period, and whether the specimen came from marble, byon, or a particular mixed fluorescent assemblage.
Notable scapolite-related finds include gem material from Kyatpyin and Kathé represented in the Gübelin Collection, a deep violet 4.083 ct Mogok scapolite described by Anderson and Payne in 1954, and later specimen-market material such as lavender scapolite from a find said to have emerged around 2002. Recent collector interest has also focused on Pein-Pyit/Pyant Gyi assemblages in which scapolite occurs with hackmanite and johachidolite, sometimes producing a visually complicated daylight/UV/after-UV specimen rather than a simple single-species display.
Mogok scapolite ranges from mineral-specimen crystals to cut gems and cabochons. The most scientifically studied recent samples were transparent, colorless to faintly yellow, with good crystal morphology and visible longitudinal growth features. Refractive indices measured on two samples averaged about 1.556 and 1.560, with birefringence in the 0.010–0.020 range, and specific gravities around 2.65. Under ultraviolet light, those samples showed strong pink to purple-pink fluorescence—strong pink-purple under longwave UV and strong pink under shortwave UV.
Chemically, the analyzed Mogok material plots as Cl-rich dipyre, toward the marialite-rich side of the scapolite solid solution rather than toward meionite. That chemistry is important because scapolite can incorporate Cl, CO3, and SO4 components in its structure, making it a useful recorder of the volatile-rich fluids that passed through the Mogok marbles and calc-silicate rocks. In the studied Mogok scapolites, Raman spectroscopy identified graphite as dark inclusions, tying the crystals to the carbon-bearing marble environment.
Crystal habit is typically prismatic to short-prismatic where crystals are free enough to show form. In matrix, scapolite may appear as pale, blocky, glassy grains or prismatic crystals in marble, and it may be less visually obvious than ruby, spinel, pyrite, or hackmanite unless the specimen is examined closely. Some collector pieces show striated prism faces and silky internal reflections, while others are granular or intergrown with feldspar, sodalite, and johachidolite.
Color is more varied in the gem and specimen trade than the two recent analytical samples alone would suggest. Documented Mogok scapolites include colorless, pale yellow, pink, reddish-purple, violet, lavender, and orangy-red gem material. The GIA Gübelin Collection includes a 6.22 ct light grayish reddish-purple chatoyant cabochon from Mogok (Kathé), an 8.09 ct medium very slightly brownish orangy-red triangular stone from Mogok (Kyatpyin), and several other Myanmar scapolites in the 7–12 ct range. A 1954 report described deep violet Mogok scapolite as an unusual color compared with pink and white stones then already known from the district.
Associated minerals are a major part of the locality’s identity. Mindat photo data and individual specimen records document scapolite with johachidolite, hackmanite, feldspar, thorianite/uranothorianite, ruby, phlogopite, spinel, pyrite, and apatite. Other geological studies of the marbles add calcite, diopside, dolomite, K-feldspar, titanite, zircon inclusions in ruby, graphite, and olivine/forsterite. Among specimen collectors, particularly attractive associations include ruby and scapolite in marble, spinel with pyrite in scapolite marble, and mixed fluorescent assemblages from Pein-Pyit/Pyant Gyi.
Size varies by mode of occurrence. Faceted and cabochon stones in the GIA data range from about 6 to over 12 ct for documented Myanmar examples on the public scapolite project page, while specimen-market crystals include miniature and small-cabinet examples, such as a 3.6 cm meionite/scapolite-group crystal from Ohn-bin-ywe-htwet and a 4.5 cm lavender scapolite specimen from the Mogok area. Matrix specimens with scapolite as an accessory may be larger, but the scapolite itself can be a subordinate mineral.
Quality is judged differently for crystals, matrix pieces, and gems. For crystals, collectors look for transparency, unabraded prism faces, visible terminations, strong luster, attractive color, and lack of bruising along edges. For matrix specimens, locality character and association often outrank crystal perfection: a small scapolite accent beside ruby in white marble may be more desirable than a larger anonymous pale crystal. For fluorescent assemblages, the appeal lies in separated responses under UV, documented tenebrescence of associated hackmanite, and clear identification of scapolite rather than mere “white matrix.”
The first authenticity issue is nomenclature. “Scapolite” is a group name in collector usage, not a single IMA-approved species name. Mogok pieces may be labeled scapolite, meionite, marialite, dipyre, or simply “scapolite group.” Modern analysis of Mogok samples points to Cl-rich dipyre, while some older gemological literature placed particular stones near the marialite–dipyre boundary. Unless a specimen has analytical work, “scapolite” is usually the safest label.
The second issue is locality precision. “Mogok” can mean the town, the valley, the township, the broader Stone Tract, or an old trade source. A specimen labeled only “Mogok, Burma” may still be legitimate, especially if from an old collection, but it is less informative than one labeled Kyatpyin, Kathé, Ohn-bin-ywe-htwet, Dattaw, Pein-Pyit, Pyant Gyi, or another named locality. Because Mogok produces many pale silicates and feldspathoid-related minerals, locality and species labels should be treated as separate questions: a good locality label does not automatically prove the mineral species.
There are no well-documented, locality-specific fake Mogok scapolite specimens that dominate the mineral market in the way fake or treated ruby does in the gem trade. The more realistic risks are misidentification, incomplete labeling, repaired crystals, and mixed fluorescent assemblages in which scapolite is only one component. In Pein-Pyit/Pyant Gyi-type material, white to pale phases may be scapolite, feldspar, sodalite/hackmanite, or mixtures; Raman, FTIR, or careful optical work may be needed for confident identification.
Treatments are more relevant to cut stones than to mineral specimens. Scapolite is generally sold untreated, but gem sources note that some lavender or pinkish colors can be produced or modified by heat treatment. A collector buying a cut Mogok scapolite for color should ask for treatment disclosure and, for significant stones, a laboratory report. For crystallized specimens, artificial color enhancement is less commonly the issue than repaired breaks, oiling or wetting for photography, or labels that overstate rarity or locality specificity.
Condition deserves close attention. Scapolite has modest hardness, around 5–6, and is not as tough as quartz in practical handling. Prismatic crystals may have bruised terminations, chipped edges, cleaved or splintery areas, and surface etching. In marble matrix, differential hardness can make cleaning risky: aggressive acid treatment may attack carbonate matrix and change the specimen’s character, while mechanical trimming can bruise pale scapolite before the damage is obvious. Fluorescent assemblages with hackmanite, feldspar, johachidolite, and uranothorianite should be handled with particular care, both for fragility and, where uranium/thorium-bearing phases are present, sensible radiation hygiene.
Rarity is real but nuanced. Mogok scapolite is not rare in the sense that the district lacks the species; Mindat records many scapolite occurrences and numerous photographs. What is rare is fine, display-worthy scapolite with strong Mogok character: sharp, gemmy crystals; attractive lavender or violet color; scapolite clearly associated with ruby or spinel in marble; or a well-documented fluorescent/tenebrescent assemblage with analysis-backed species identification. Many available pieces are small, pale, included, granular, or accessory to more famous minerals.
Market availability is episodic. Older auction records show modest prices for small to miniature examples, including a 3.6 cm gemmy meionite/scapolite-group crystal from Ohn-bin-ywe-htwet that closed at $38 in 2021 and a 4.5 cm lavender Mogok scapolite miniature that closed at $123 the same year. Those prices should not be read as a cap on value: a superb crystal, a strong matrix association, or a documented old-collection gem could command much more. Rather, they show that Mogok scapolite remains a specialist’s mineral—still obtainable, still underappreciated, and most rewarding when the buyer understands the geology behind the label.
The most vivid accounts of Mogok mining are written for ruby, but they describe the same ground from which scapolite-bearing marble assemblages and associated gem minerals enter collections. Tony Waltham’s late-1990s visit captures a district where geology is not abstract: it is a lived landscape of shafts, sieves, marble pinnacles, and packets of stones opened on low market tables.
At Kyatpyin, Waltham described lebin shafts 30 m deep, ventilated not by elaborate mine engineering but by air pumped through plastic piping that emerged from a carrier-bag “junction box.” The miners wore shorts and T-shirts; there were no ladders. To descend, one climbed the bamboo lining carefully. It is hard to imagine a more direct contrast between the elegance of a gem crystal and the improvisation that brings it to daylight.
The washing scene is equally precise. Porters carried mined earth from the shafts to a collective washing place, where it was tipped into open boxes about 3 m square, soaked, trampled, and shoveled into fine-mesh hand sieves. The miners bent double, shook and twisted the sieveful of mud half in water, then flipped the contents onto the spoil pile so that the heavy stones sat on top. Color did much of the work. Rubies and spinels could be picked out by eye, but the same patient concentration is why accessory gem minerals from Mogok—scapolite included—sometimes survive the commercial sorting chain rather than disappearing into waste.
At Shwepyiaye, the scale changed. The open pit had been started in 1987 and was about 300 m across and more than 30 m deep when Waltham described it. Nearly 10 m of barren red overburden had been stripped away to expose byon. Yet even there, machinery failed at the marble rockhead. Karstic dissolution had fretted the marble into a chaotic profile of fissures, blades, ribs, arches, and spires up to 5 m high. The richest clay lay between those pinnacles, and miners had to dig it out by hand, bag by bag, before porters carried it away.
The washing plant at Shwepyiaye processed about 100 tonnes of byon per day for roughly 25 carats of ruby, about the same amount of sapphire, and more spinel and other stones. That is the arithmetic behind Mogok’s romance: immense labor, minuscule yield, and the possibility that the next upturned sieve will hold the stone everyone remembers. Waltham calculated the ruby yield at about 0.05 ppm—rarity expressed as a concentration, not a slogan.
Hard-rock mining supplied its own drama. At the Gatotat mine, a richly mineralized calcite vein only 2–3 m wide dipped at 80° and had been followed to a depth of 300 m. Fifteen stagings occupied the open stope, with minimal timber braces and no sign of ladders. It took miners more than an hour to climb down to the working faces, after which calcite broken from the vein was shuttled upward stage by stage using hand-powered winches. At the surface, groups of men and women hammered open the crystalline calcite in search of hidden rubies, with spinels as consolation. For a scapolite collector, this is the important image: Mogok’s minerals are not simply loose alluvial gems, but products of marble, calcite veins, and high-grade rock opened piece by piece.
At Linyaungchi, tunnels followed a complex of calcite veins along a major fault and minor faults. One active tunnel, about 2 m high and wide, was timber-propped through stacked waste and driven by blasting with a hand-held percussion drill on a single pneumatic leg. Nearby, the Dattaw mine had broken into a natural cave more than 10 m high. The miners continued because the collapsed and karstic zones yielded good stones. A notice in the mine office listed 127 rubies and 10 sapphires larger than 3 carats found in the previous three years; the largest ruby was 87 ct and sold for £100,000.
Then there is the market, where geology becomes paper packets and trust. Mogok and Kyatpyin had open-air markets with large sections for ruby dealing. Waltham observed that most trading was done by women, gathered around low tables, producing folded packets from pockets and handbags. The stones were passed around quietly; most were uncut, flawed, under 10 carats, and less than 10 mm across. Thick wads of banknotes changed hands, but the discussion remained discreet. Alongside ruby were sapphire, spinel, topaz, peridot, tourmaline, smoky quartz, lapis lazuli, moonstone, and the lesser gemstones of the byon. Scapolite belongs to that second world: not the headline stone, but part of the deep mineral inventory that makes Mogok inexhaustibly interesting.
The old British open pit left perhaps the most enduring geological monument. Mogok town originally stood on the valley floor, but before 1900 it was moved so the valley could be worked as a giant open pit. The byon reportedly contained 17 ruby-rich horizons. A 2,000 m drainage tunnel kept the pit workable until it collapsed in 1925; the flooded excavation became the lake at the heart of the town. Mogok’s landscape is therefore not merely a setting for gem mining—it has been physically reorganized around the search for minerals.
Yuan, P.; Zhao, Y.; Xu, B.; Shen, J. “A Study on the Mineralogy and Volatile Fraction of Scapolite from Mogok, Myanmar.” Crystals 12(12), 1779, 2022. — The key modern analytical paper on Mogok scapolite, documenting gemological properties, UV fluorescence, Raman/IR/UV-visible spectra, graphite inclusions, and Cl-rich dipyre composition.
Searle, M. P.; Garber, J. M.; Hacker, B. R.; Htun, K.; Gardiner, N. J.; Waters, D. J.; Robb, L. J. “Timing of syenite-charnockite magmatism and ruby and sapphire metamorphism in the Mogok valley region, Myanmar.” Tectonics 39, e2019TC005998, 2020. — Important geochronological and geological framework for the Mogok Metamorphic Belt, including marble, syenite-charnockite, skarn, and ruby/spinel/sapphire assemblages.
Waltham, Tony. “The ruby mines of Mogok.” Geology Today 15(4), 143–149, 1999. — A vivid geological and mining account of Mogok’s byon placers, shaft mines, open pits, hard-rock workings, and gem markets.
Anderson, B. W.; Payne, C. J. “Three Gemstones from Burma.” The Journal of Gemmology 4(8), 1954. — Early gemological note describing a deep violet 4.083 ct Mogok scapolite and comparing it with known pink and white Mogok material.
Mindat: Scapolite from Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar. — Locality database entry listing scapolite from Mogok Township, associated minerals from photo data, and numerous specific sublocalities.
Mindat photo 791600: Spinel, scapolite, and pyrite from Kyauk-saung-Kyatpyin, Marble Ark, Mogok. — Documented specimen record for deep bordeaux to raspberry spinel with minor pyrite in scapolite marble.
Mindat photo 1408765: Johachidolite and scapolite from the Pyant Gyi mine, Pein-Pyit, Mogok. — Raman-confirmed johachidolite with associated scapolite/marialite-like phase in a fluorescent Mogok assemblage.
Mindat photo 1409255: Johachidolite, hackmanite, and scapolite from the Pyant Gyi mine, Pein-Pyit, Mogok. — Useful specimen record for separating scapolite from tenebrescent hackmanite in mixed Mogok fluorescent material.
Mindat: Scapolite from Mogok Township — Best starting point for sublocalities, associated minerals, and photo-linked occurrence data.
Yuan et al., 2022, Crystals: A Study on the Mineralogy and Volatile Fraction of Scapolite from Mogok, Myanmar — Essential scientific paper specifically on Mogok scapolite chemistry, spectroscopy, fluorescence, and inclusions.
Searle et al., 2020, Tectonics: Mogok syenite-charnockite magmatism and ruby/sapphire metamorphism — Regional geologic context for the marble, skarn, and intrusive systems that host Mogok gem minerals.
Waltham, 1999: The ruby mines of Mogok — Field-rich account of Mogok mining methods, byon gravels, hard-rock workings, and gem-market life.
GIA Gübelin Gem Project scapolite index — Public GIA documentation for multiple scapolite gemstones, including Myanmar/Mogok examples.
GIA Gübelin Collection scapolite 34659, Mogok (Kathé) — Detailed record for a chatoyant Mogok scapolite cabochon.
GIA Gübelin Collection scapolite 34597, Mogok (Kyatpyin) — Detailed record for an 8.09 ct orangy-red Mogok scapolite.
Anderson and Payne, 1954: Three Gemstones from Burma — Historical gemological note including a deep violet Mogok scapolite.
Mineral Auctions archive: Meionite from Ohn-bin-ywe-htwet mines, Mogok — Useful market record for a gemmy scapolite-group crystal from a specific Mogok locality.
Mineral Auctions archive: Lavender scapolite from the Mogok area — Market record noting a small lavender Mogok scapolite find that reportedly came out around 2002.
Wikimedia Commons: Corundum–Scapolite from Mogok — Open-license specimen photograph showing scapolite in the classic ruby-marble context.
GIA Gübelin Gem Project: Various Gems, Sapphirine–Stibiotantalite. — Index page for multiple documented GIA Gübelin Collection scapolites, including several Myanmar examples.
GIA Gübelin Collection scapolite 34659, Myanmar, Mandalay Division, Mogok (Kathé), 6.22 ct. — Documented chatoyant reddish-purple Mogok scapolite cabochon with parallel exsolution needles.
GIA Gübelin Collection scapolite 34597, Myanmar, Mandalay Division, Mogok (Kyatpyin), 8.09 ct. — Documented orangy-red Mogok scapolite with gemological data and plate-like inclusions.
Wikimedia Commons: Corundum–Scapolite from Mogok, photo by Rob Lavinsky. — Open-license image of a ruby in marble accented with scapolite crystals, useful for visualizing the classic marble-hosted association.
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