A collector's guide to Belqeys Mountain, null: its geology, mining history and notable minerals, illustrated with the 77 specimens documented from this locality on EarthWonders.
Key facts
Belqeys Mountain, better known to many collectors as Kuh-e-Belgheys, is one of the modern localities that changed how serious garnet collectors think about demantoid. The occurrence lies in the Takab area of West Azerbaijan Province, northwestern Iran, in a skarn and calc-silicate setting tied to metamorphosed Paleozoic rocks, ophiolitic serpentinite–diabase–basalt assemblages, marble and limestone horizons, and nearby granodioritic to granitic intrusions. Its specimens are not sought as cutting rough in the classic gem-mining sense; their importance is overwhelmingly as crystallized mineral specimens—deep green, lustrous, often translucent rather than transparent, and large enough to make strong thumbnail through cabinet displays.
The classic Belqeys look is unmistakable: chromium-rich green andradite crystals, commonly labeled demantoid, perched on pale carbonate or calc-silicate matrix, frequently with a sugary coating or carpet of pale green diopside. The best pieces show isolated, sharply formed crystals or rich clusters with dodecahedral and trapezohedral faces, a saturated grass- to emerald-green color, and enough separation from the matrix to give the crystal architecture real visual authority. Some crystals show concentric zoning and internal microfracturing; that internal complexity is part of the locality’s character, but the finest specimens balance deep color with bright face luster and minimal bruising.
Regional View
Country View
Belqeys belongs to a broader Iranian garnet story in which skarn, metamorphic, ophiolitic, and granitoid-related settings have produced a striking range of garnet compositions. Within that landscape, the Takab occurrence stands out because chromium-bearing green andradite occurs as collectible crystals rather than merely as small disseminated skarn garnet. The chromium source is understood in connection with the ophiolitic ultramafic component of the local metamorphic package, while the carbonate host and hydrothermal fluids provided the setting for calcium-rich silicate mineralization.
Photo: Fabre Minerals
Search for specimens: View all specimens from Belqeys Mountain, null
Belqeys Mountain is a mountain locality in Takab County, West Azerbaijan Province, Iran, in the northwestern part of the country. Collector labels may read Belqeys Mountain, Belqeys Mountains, Kuh-e-Belgheys, Takab, or Takan Tepe; the essential collecting locality is the same demantoid-bearing area in the Takab district. The occurrence has been described in the context of the Baba Nazar–Belqeys garnet-bearing zone, where green garnet occurs in calc-silicate and skarn-like horizons rather than in the classic Russian-style serpentinite fissure environment.
The mineralization is hosted principally by limestone and marble horizons enclosed in a metamorphic pile that includes mica schists, quartzites, amphibolite, and metamorphosed ophiolitic rocks such as serpentinite, serpentinite schist, diabase and basalt. A granodioritic intrusion of probable Jurassic age has been interpreted as the likely heat and fluid source for skarn development, although the wider Takab metamorphic complex preserves a much older and more complex crustal history. For the collector, the practical result is a very distinctive matrix: pale marble or limestone, fine diopside, carbonate, iron oxides and locally darker opaque minerals, with green garnet sitting in pockets and veinlets through the carbonate-rich layers.
The ore-body language here is better understood as localized skarn and calc-silicate mineralization than as a large industrial garnet mine. Published descriptions emphasize pockets and veinlets in limestone, with demantoid associated with diopside, calcite, quartz, pyrite and magnetite. The green color is chromium-related, and analyses from the Baba Nazar–Belqeys material show an andradite–grossular garnet with a significant uvarovite component rather than pure end-member andradite. That chemistry helps explain why some specimens have the rich green color collectors expect from demantoid while still showing zoning, opacity, and internal complexity more typical of skarn garnets than facetable gem rough.
The collecting history is recent by garnet standards. Belqeys material began appearing on the international specimen market in the early 2010s and was being treated by 2014 as a new and important Iranian demantoid occurrence. Later market appearances, particularly around 2015–2017, showed that the locality could produce both rich matrix specimens and unusually large isolated crystals. Scientific abstracts published in 2022 described the locality as having been exploited for about fifteen years, which fits the modern-market timeline: first a surprise novelty, then a short period of relative availability, then a more selective and less abundant presence in dealer inventories.
No long-lived named industrial operator is central to the specimen story. The material reaching collectors appears to have come from small-scale extraction and local specimen recovery rather than from a major mechanized mine producing garnet as an ore commodity. Access should therefore be treated cautiously. This is not a public fee-collecting locality, and any visit would require current permission from landholders, mineral-rights holders, and local authorities, as well as a realistic understanding of field conditions in the Takab region. For most collectors, Belqeys is a market locality rather than a practical field destination.
The notable finds are remembered less as named pockets than as market waves. Early specimens included sharp, dark green crystals to several centimeters on pale yellow-green matrix, often with visible contacts and roughness but extraordinary color. Subsequent finds supplied brighter miniature and small-cabinet pieces with 0.8–1.5 cm crystals scattered across matrix, as well as occasional large single crystals and parallel-growth pairs. The largest reported crystals from the locality reach roughly 5–8 cm depending on the source and measurement context, but most desirable specimens are valued not simply by maximum size: balance, matrix contrast, undamaged terminations, rich green color and lively luster matter more than a huge but dull, fractured crystal.
Belqeys demantoid is the chromium-bearing green variety of andradite that made the locality famous, occurring in pockets and veinlets in carbonate-rich skarn and calc-silicate rock with diopside, calcite, quartz, pyrite and magnetite. Crystals are commonly dodecahedral to trapezohedral–dodecahedral combinations, ranging from small scattered crystals on matrix to individuals over 2 cm, with exceptional crystals reported to more than 5 cm and, in one published specimen-mineralogy abstract, as large as 8 cm. The color ranges from bright grass green to deep forest or emerald green, and the best specimens combine saturated color with glossy faces, sharp edges, attractive spacing on pale marble or diopside-coated matrix, and minimal bruising; ordinary pieces are more likely to be dark, internally fractured, contacted, dull, or crowded into massive garnet-rich crusts.
“Garnet” on Belqeys labels almost always means the local green calcic garnet suite—demantoid-bearing andradite with grossular and uvarovite components—rather than the red almandine-pyrope imagery many collectors associate with the name. The garnets occur as anhedral to euhedral green crystals in calc-silicate/skarn rock, and the locality is especially admired for matrix specimens in which single or multiple green crystals sit on pale carbonate or fine diopside, sometimes accompanied by smaller orange-brown garnets on the same piece. Good Belqeys garnet specimens show unmistakable crystal form, lively luster, clean separation from matrix and strong green color; less desirable examples may still be mineralogically interesting but are massive, contact-marked, heavily included, or too dark to show the crystal faces well.
Andradite is the formal species identity behind the Belqeys demantoid specimens, with Ca3Fe3+2(SiO4)3 as the ideal end-member formula, though Belqeys analyses show meaningful substitution by Al and Cr and a composition that can bridge toward grossular and uvarovite components. Its local habits are robust dodecahedra, trapezohedra, and combinations of the two, generally bright to highly lustrous when fresh and commonly translucent rather than gem-transparent. The locality’s best andradites are valued as sculptural matrix specimens: a large, lustrous green crystal or a balanced scatter of smaller crystals on pale skarn is preferable to a bigger but dull or bruised crystal, and specimens retaining natural diopside or carbonate matrix are usually more desirable than loose damaged individuals.
Other minerals documented from Belqeys Mountain are few but important for reading the specimens correctly. Diopside is the most characteristic associate, often forming the pale green, fine crystalline “carpet” beneath the garnet; calcite and carbonate matrix are common in the visual presentation; vesuvianite is listed from the locality; and scientific descriptions of the demantoid-bearing rock also mention quartz, pyrite and magnetite in the mineralized limestone. No type-locality mineral is documented from Belqeys Mountain itself in the standard locality records; the significance of the locality rests on specimen-quality chromium-bearing green andradite, not on new-species mineralogy.
Belqeys specimens are generally straightforward as natural mineral specimens, but attribution deserves care. Iranian demantoid has been sold from more than one locality, and older or casual labels may blur Belqeys Mountain, Baba Nazar, Soghan in Kerman Province, or simply “Iran.” The safest labels preserve the Takab County, West Azerbaijan Province provenance and, ideally, the dealer or collection history. A particularly relevant caution is that some specimens in circulation or online imagery have been reattributed after originally being posted under another Iranian locality, so good paperwork matters.
The main condition issues are endemic to the material. Belqeys crystals commonly have internal inclusions, microfractures, healed cracks, limonite staining, dull zones, or contact marks where adjacent crystals or matrix pressed against them during growth. These features should not automatically be read as post-mining damage; the locality is known for included and fractured crystals, and even very strong examples may be translucent rather than transparent. Actual damage is different: chipped edges, abraded high points, missing terminations and freshly broken crystal backs are the defects to watch for under magnification.
The best Belqeys pieces are not judged by gem clarity. In fact, published work notes that gemmy demantoids have not been a notable product of the locality. A top specimen succeeds as crystallized garnet: it should have lively face luster, saturated green color, sharp geometry, attractive contrast against pale matrix, and as little obvious bruising as possible. Crystals in the 0.5–1.5 cm range on good matrix are common enough to define the classic look; clean crystals exceeding 2 cm, and especially large well-positioned crystals, are much more desirable. Very large crystals can be spectacular, but many are dark, fractured or contacted.
No widely documented treatment practice is central to Belqeys material. Cleaning, however, can change the look dramatically. Carbonate matrix and fine diopside coatings are part of the specimen’s identity, so aggressive acid work or mechanical picking can diminish both aesthetics and locality character. Since calcite and marble are common matrix materials, acid exposure should be approached very cautiously. The garnet itself is hard and durable, but the matrix may be friable, and sharp demantoid faces can still bruise if pieces are stored loose against other minerals.
Market availability has moved from novelty abundance to intermittent supply. In the mid-2010s Belqeys demantoids were visible through several major Western dealers; by 2021 they were described as once briefly common but already less available. Today they still appear regularly enough that a determined collector can find examples, but fine matrix pieces with clean, saturated, lustrous crystals are selectively competed for. The locality remains one of the few modern sources where a collector can obtain substantial green demantoid crystals on matrix without entering the price tier of the finest antique Russian classics.
Belqeys entered the Western collecting conversation with the particular excitement that surrounds a new, visually unmistakable locality. By July 2014, Thomas P. Moore was already describing “a new locality in Iran” reported 34 km northeast of Takab. The specimens he was seeing were not delicate gem rough; they were sharp, very dark green trapezohedral crystals, some reaching about 3.5 cm, perched on pale yellow-green earthy matrix. They had their flaws—rough spots, contacts, damage and subdued luster—but they also had the unmistakable presence of something new. In the same report, Geokrazy Minerals was offering four examples in a thumbnail gallery: one loose complete 2 cm crystal priced at $300, and three matrix specimens at $250, $140 and $120. Moore’s verdict was immediate and unusually direct for a new occurrence: it was safe to call Belqeys “a major occurrence of colorful and unusual garnets.”
Seven years later, the market mood had changed. In 2021, Moore returned to Belqeys while discussing Jack Lowell’s Colorado Gem & Mineral Company and noted that collectors had known the occurrence for about seven years. The demantoids had been “briefly almost common” but were by then much less so. That one phrase captures the arc of many modern localities: first disbelief, then a rush of availability, then a narrowing of supply as the easy pockets are exhausted or the best pieces disappear into collections. The specimens Lowell offered were bright grass-green andradite variety demantoids over fine-grained gray matrix, with highly lustrous crystals showing dodecahedral and trapezohedral faces in roughly equal measure. Individual crystals to 1.5 cm could cover matrix plates thickly enough that a 5 cm miniature looked dramatic.
The scientific story caught up with the collector story at the 49th Rochester Mineralogical Symposium in April 2022. Jamshid Ahmadi, John Rakovan and Bahman Rahimzadeh presented Belqeys demantoid not as a curiosity of the trade, but as a mineralogical problem worth imaging and analyzing. They described skarn mineralization in limestone layers within metamorphosed Paleozoic amphibolite and ophiolitic rocks, with the demantoid occurring in pockets and veinlets with pyrite, magnetite, quartz, calcite and diopside. One figure showed demantoid crystals on marble matrix covered with limonite, and a fractured crystal displayed the locality’s characteristic concentric zoning. Three samples were cut into polished thin sections for SEM imaging, XEDS analysis and optical work. The results gave collector observations a chemical backbone: chromium, aluminum and silicon varied with the visible zones, and chromium rose from about 0.1 weight percent in darker zones to about 0.8 weight percent in brighter regions.
There is a pleasing irony in Belqeys demantoid: the crystals can be large and beautifully shaped, yet the locality is of limited interest to the gem industry. The same internal features that make the specimens scientifically rich—zoning, inclusions and microfractures—limit their usefulness as faceting rough. For mineral collectors, however, that is precisely why Belqeys matters. It is a locality for crystals on matrix, for morphology and geology, for the saturated green of chromium-bearing andradite standing against pale carbonate rock, not for calibrated stones in jewelry trays.
Jamshid Ahmadi, John Rakovan and Bahman Rahimzadeh, “Demantoid from the Belqeys Mountain, West Azerbaijan, Iran,” in Forty-Ninth Rochester Mineralogical Symposium: Contributed Papers in Specimen Mineralogy—Part 1, Rocks & Minerals 97:5, 448–451, 2022. DOI: 10.1080/00357529.2022.2074255. ResearchGate abstract and full-text record
Ziba Khodaean Chegeni, Nematollah Rashidnejad Omran, Ali Akbar Baharifar, Carmela Vaccaro and Aida Maria Conte, “Mineral chemistry and origin of chromium in uvarovite-bearing garnets from Baba Nazar (NE Takab),” Iranian Journal of Crystallography and Mineralogy 29(1), 49–62, 2021. CNR institutional record
Fatemeh Nouri, Robert J. Stern and Hossein Azizi, “A review of garnet deposits in western and southern Iran,” International Geology Review 64(1), 17–44, 2022; published online 11 January 2021. DOI: 10.1080/00206814.2020.1838335. Taylor & Francis abstract
Robab Hajialioghli, Mohssen Moazzen, G. T. R. Droop, R. Oberhänsli, R. Bousquet, A. Jahangiri and M. Ziemann, “Serpentine polymorphs and P–T evolution of metaperidotites and serpentinites in the Takab area, NW Iran,” Mineralogical Magazine 71(2), 203–222, 2007. DOI: 10.1180/minmag.2007.071.2.203. ResearchGate record
Mindat locality record for Belqeys Mountain, Takab County, West Azerbaijan Province, Iran, listing andradite var. demantoid, diopside and vesuvianite, with references to Hajialioghli et al., Chegeni et al., and Nouri et al. Mindat locality page
Mindat occurrence record for demantoid from Belqeys Mountain, including analytical data and associated minerals based on photo data. Mindat demantoid occurrence page
Thomas P. Moore, “What’s New in the Mineral World? Report #38,” The Mineralogical Record, 19 July 2014, noting early Western-market Belqeys demantoids and their significance as a new Iranian occurrence. PDF
Mindat: Belqeys Mountain, Takab County, West Azerbaijan Province, Iran — Best single locality database entry, with mineral list, geological notes and references.
Mindat: Demantoid from Belqeys Mountain — Species-level occurrence page with analysis data, associated minerals and photo-gallery links.
Mindat: Belqeys Mountain photo gallery — Useful visual survey of crystal habits, matrix styles and specimen sizes.
Fabre Minerals: Belqeys Mountain demantoid large photo — Dealer photograph documenting the classic green crystals on pale matrix.
Fabre Minerals search results for andradite demantoid — Includes multiple Belqeys examples with specimen dimensions and descriptive notes.
The Mineralogical Record: What’s New in the Mineral World? Report #38 — Early 2014 market report recognizing Belqeys as a major new occurrence.
The Mineralogical Record: What’s New in the Mineral World? Report #61 — Later market perspective on Belqeys availability and specimen quality.
ResearchGate: Demantoid from the Belqeys Mountain, West Azerbaijan, Iran — Rochester Symposium abstract with locality geology, crystal morphology, zoning and SEM/XEDS work.
Taylor & Francis: A review of garnet deposits in western and southern Iran — Regional scientific framework for Iranian garnet deposits and their geological associations.
CNR IRIS: Mineral chemistry and origin of chromium in uvarovite-bearing garnets from Baba Nazar (NE Takab) — Abstract and bibliographic record for the study most directly addressing the chromium-bearing Takab garnets.
Thomas P. Moore, “What’s New in the Mineral World? Report #61,” The Mineralogical Record, 2021, describing Belqeys demantoids as once briefly common but subsequently less available, with lustrous grass-green crystals on matrix. PDF
Vimeo: Fabre Minerals Belqeys demantoid video — Short rotating video of a representative matrix specimen.
