Yaogangxian muscovite is best understood as a locality signature rather than as an isolated, stand-alone mica collectible. The mine’s most desirable muscovite-bearing specimens are architectural combination pieces: purple, blue, green, or honey fluorite perched on sparkling mica; scheelite set into silvery mica books; metallic arsenopyrite, stannite, ferberite, and sulfosalts rising from mica-rich quartz vein matrix. In these specimens, muscovite supplies the texture that makes Yaogangxian material instantly recognizable—cream, tan, beige-silver, yellowish, or greenish micaceous druses and rosettes that glitter beneath more strongly colored crystals.
Photo: Wikimedia Commons
The locality sits in one of the great tungsten–tin metallogenic districts of South China’s Nanling Range. At Yaogangxian, Mesozoic granitic intrusions and their hydrothermal fluids produced a complex tungsten-tin system in which quartz veins, greisen-style alteration, and skarn mineralization all play a role. Muscovite occurs in that hydrothermal environment as a gangue and alteration mineral, especially in mica-quartz veins and micaceous vein selvages. For collectors, that geological role is exactly what gives the mineral its importance: muscovite is the sparkling, layered foundation on which many of the mine’s most admired fluorites, scheelites, arsenopyrites, and tungsten minerals are displayed.
Photo: Wikimedia Commons
The appeal is partly visual and partly historical. Yaogangxian is an old and prolific tungsten mine, active since the early twentieth century, and western collectors came to know its specimens as Chinese mineral exports expanded in the 1990s and 2000s. Muscovite-bearing pieces helped define the “Yaogangxian look”: sharp, glassy fluorite cubes with phantoms sitting on bubbly mica; scheelite crystals against silvery mica; arsenopyrite and quartz combinations with micaceous sparkle in the recesses. The best examples are not valued because the muscovite is large, but because it is fresh, lustrous, undamaged, and compositionally integral to the specimen.
Search for specimens: View all muscovite specimens from Yaogangxian Mine, China
Yaogangxian Mine is in the Yaogangxian tungsten-tin ore field of Yizhang County, Chenzhou, Hunan Province, China. Mindat places the mine at approximately 25° 38' 35" N, 113° 19' 17" E, and records the Chinese locality name as 瑶岗仙矿. The mine is part of the Nanling nonferrous metallogenic zone, a region famous for granite-related tungsten, tin, molybdenum, fluorine, beryllium, and polymetallic mineralization.
The mine field is not a single simple vein but a composite tungsten-tin system related to the Yaogangxian composite pluton. The pluton intruded Cambrian to Devonian sedimentary rocks, mainly sandstones and slates, with Jurassic limestones also involved in the broader contact setting. The mining field covers roughly 4 by 2.5 km and includes two principal styles of ore: the Yaogangxian quartz-vein tungsten-tin deposit, with minor greisen-style mineralization, and the Heshangtan skarn-type tungsten-tin deposit. The quartz-vein system has been mined since 1914. Heshangtan was discovered in 1947, explored in the 1950s, and mined from the early 1960s.
In the quartz-vein system, the veins are hosted in the biotite granite phase of the pluton and in its western and northern contact zones. They trend mainly northwest to north-northwest and are grouped in the Yangmeiling, Luchangping, and Hamashi ore blocks. Published geological work describes more than 200 ore veins, with individual veins reported up to 1,200 m long, as much as 1.5 m wide, and extending 100 to 1,000 m down dip. Ore minerals include wolframite-series minerals and molybdenite, with associated arsenopyrite, cassiterite, chalcopyrite, pyrite, bournonite, and other sulfides and sulfosalts. Gangue minerals include quartz, mica, feldspar, fluorite, and calcite.
Muscovite belongs naturally to this setting. In vein descriptions, mica is reported in selvages with wolframite and molybdenite, and hydrothermal muscovite has been specifically documented from a mica-quartz vein in Cambrian slate in the Yangmeiling mining adit. That is a useful anchor for collectors: the micaceous matrix seen on many specimens is not accidental decorative material, but part of the same hydrothermal architecture that built the tungsten-bearing vein system.
Specimen production has been especially important from open cavities in the wolframite-quartz veins. These cavities yielded the brilliantly lustrous fluorite, ferberite-hübnerite series minerals, bournonite, arsenopyrite, scheelite, quartz, and combination pieces that made Yaogangxian famous. Muscovite most often appears as matrix, druse, or rosetted mica in those associations. The locality remains a working or historically worked mining area, not a casual public collecting site. Collector access should be treated as industrial-mine access: specimens reach the market through miners, exporters, dealers, old collections, and recent marketplace circulation rather than through ordinary field collecting.
Yaogangxian muscovite typically forms fine-grained to small crystalline aggregates rather than the large “books” prized from pegmatite localities. Published sampling from the Yangmeiling adit describes euhedral mica aggregates about 1 to 3 mm across in a mica-quartz vein. Collector specimens broaden that view: the muscovite may appear as lamellar crystals, leafy rosettes, sparkling micaceous crusts, bubbly or botryoidal-looking aggregates, and greenish or beige-silvery balls of mica on which fluorite and other minerals are seated.
The color range is one of the locality’s quiet pleasures. Yaogangxian muscovite may be cream, tan, beige, silvery white, yellowish, pale gray, or greenish. On fluorite specimens, greenish muscovite is especially attractive because it contrasts with purple or blue fluorite while maintaining a granular, glittering surface. Tan and yellowish muscovite gives a warmer look to blue-purple fluorite combinations, and silvery muscovite provides a cooler, more metallic sparkle with scheelite, arsenopyrite, or quartz.
The most familiar habit in cabinet specimens is a micaceous matrix: many small mica plates tightly intergrown into a sparkling carpet. On high-grade pieces, that matrix is not just a base but a visual field, with small mica faces reflecting light around one or more principal crystals. Better examples show undisturbed, fresh mica surfaces rather than dull, clayey, oxidized, or abraded material. Mica that is too massive, dirty, or visually dead is less desirable unless the associated mineral is exceptional.
Typical associated minerals include fluorite, quartz, calcite, dolomite, scheelite, arsenopyrite, pyrite, chalcopyrite, stannite, ferberite-hübnerite series minerals, molybdenite, sphalerite, chlorite-group minerals, chamosite, rhodochrosite, and a suite of sulfosalts. Muscovite is particularly common in the collector vocabulary around Yaogangxian fluorite: transparent purple cubes, blue-purple zoned cubes, and green or violet modified crystals are often perched on mica-rich matrix. Scheelite-on-muscovite is another classic combination, with amber to brownish pseudo-octahedral scheelite set against silvery mica.
Quality is judged by the whole specimen. The best muscovite-bearing Yaogangxian pieces have fresh, lustrous mica, strong contrast with the main crystal, a natural and undamaged contact between mica and associated minerals, and enough three-dimensional relief that the mica looks like part of the architecture rather than a flat backing. In fluorite pieces, collectors look for transparent crystals, sharp zoning or phantoms, minimal edge bruising, and a mica matrix that enhances rather than hides the fluorite. In scheelite pieces, the strongest examples show sharp, lustrous scheelite rising cleanly from mica or quartz-mica matrix. In arsenopyrite or stannite combinations, the mica should provide bright contrast without being crushed or smeared by sulfide oxidation.
The principal authenticity concern with Yaogangxian muscovite is not treatment of the mica itself. The better-documented risks are locality confusion, species confusion in associated minerals, and overbroad Chinese mine labels. Muscovite is widespread in granite-related hydrothermal systems, so a specimen labeled simply “China” or “Hunan” is not enough. A convincing Yaogangxian muscovite specimen should fit the locality’s known associations: fluorite with purple, blue, green, or zoned cubes; quartz; scheelite; arsenopyrite; ferberite-hübnerite series minerals; stannite; calcite or dolomite; and other minerals known from the Yaogangxian ore field.
Several locality-specific cautionary notes matter to collectors. Fibrous metallic sulfosalts from Yaogangxian have often been traded under simplified or incorrect names, especially as “bismuthinite,” while analyses have shown many such specimens to be stibnite, boulangerite, jamesonite, berthierite, kobellite, cosalite, or other sulfosalts. Molybdenite attributed to Yaogangxian has also been questioned in the collector literature, with some trade specimens likely coming from other localities. Mindat additionally notes that some “goshenite” attributed to Yaogangxian is actually from Pingwu, Sichuan. These cautions do not directly make muscovite suspect, but they do affect combination specimens where the value depends on every mineral and the exact locality being correct.
Condition is the main practical issue. Muscovite has perfect basal cleavage and can split, shear, or flake with careless handling. On Yaogangxian specimens, the mica matrix often consists of countless small plates; these catch dust, suffer edge rubs, and can be bruised if the specimen slides in a box. Cleaning should be conservative. Avoid aggressive brushing, ultrasonic cleaning, and prolonged soaking unless the associated minerals have been considered carefully. Fluorite edges chip easily; scheelite can show contact marks; sulfides may oxidize or loosen from the mica-rich matrix. A specimen with lively but intact mica is far preferable to one that has been scrubbed into dullness.
Rarity depends on what is being collected. Muscovite as an accessory or matrix mineral from Yaogangxian is common in the market. Fine muscovite-dominant specimens are less common, because collectors usually prize the associated fluorite, scheelite, arsenopyrite, stannite, or tungsten minerals. The finest muscovite-bearing pieces—transparent fluorite on sparkling mica, scheelite on fresh mica, or metallic arsenopyrite/stannite with mica and quartz—are much more competitive, especially when from older collections or well-documented early production.
Recent marketplace records show muscovite-bearing Yaogangxian pieces ranging from affordable quartz-with-muscovite specimens to four-figure fluorite-on-muscovite miniatures and small cabinets. In this locality, price is usually driven by the associated species and specimen aesthetics rather than by muscovite alone. A collector building a Yaogangxian suite should consider at least one specimen where muscovite is visually essential: a zoned fluorite cube standing on bubbly mica, a scheelite on silvery mica, or a metallic arsenopyrite group set into a micaceous quartz matrix.
One of the most useful field images of Yaogangxian muscovite does not come from a show case but from a dating study. In the Yangmeiling mining adit, researchers collected hydrothermal muscovite from a mica-quartz vein cutting Cambrian slate. The vein contained disseminated fine-grained sulfide aggregates, and the mica occurred as euhedral aggregates only about 1 to 3 mm across. Those millimeter-scale crystals were not chosen for beauty; they were selected, purified, and dated to constrain the age of the tungsten system. Yet the description reads like the underground origin of many collector specimens: slate wall rock, quartz, sulfide, and a glitter of mica crystallized inside a tungsten-bearing hydrothermal system.
The same study describes another mica-bearing vein in the Dayanmen adit, where phlogopite formed euhedral aggregates oriented perpendicular to the vein walls. The central part of that vein held feldspar, fluorite, chalcopyrite, minor quartz, and fine-grained wolframite. That geometry—mica at the vein margins, fluorite and ore minerals in the vein interior—is exactly the sort of natural arrangement that later becomes, on a smaller and cleaner scale, a fine specimen: mica providing the stage, fluorite or ore minerals providing the focal point.
A later collector-market story is preserved in a Mindat specimen record for a fluorite, muscovite, and calcite piece from the Kurt Hefendehl collection. The specimen is only 5.2 x 4.3 x 2.6 cm, but its description captures the classic Yaogangxian formula: water-clear purple fluorite cubes to 1.2 cm on edge, sitting on bubbly beige-silvery muscovite with minor calcite, transparent enough that the viewer can see through the fluorite to the micaceous matrix below. Hefendehl began collecting seriously at age 14, built a worldwide collection exceeding 6,000 specimens, remained active until shortly before his death in 2020 at age 82, and was especially known for classic localities and Black Forest minerals. A Yaogangxian muscovite-matrix fluorite surviving in that context says much about the locality’s status: these pieces entered serious European collections not as novelties, but as modern classics.
Another revealing collector note concerns misidentification inside Yaogangxian lots. A Mindat discussion in 2026 described an unusual topaz-bearing Yaogangxian specimen with arsenopyrite, cassiterite, ferberite, fluorite, presumed muscovite, quartz, and topaz. The writer noted that it was the only topaz he had personally seen from the mine after viewing thousands of imported specimens, and that, at the time, impressive bournonite specimens were coming out and being sold in ferberite lots. The lesson for muscovite-bearing specimens is broader than topaz: Yaogangxian is mineralogically rich enough that rare or unusual associations can be overlooked, mislabeled, or simplified in trade. Close inspection of “matrix” is often rewarded.
Ottens, Berthold, and Robert B. Cook. 2005. “The Yaogangxian Tungsten Mine: Yizhang County, Chenzhou, Hunan Province, China.” Rocks & Minerals 80(1):46–57. A key collector-facing article on the mine and its specimen mineralogy.
Ottens, Berthold. 2011. “The Yaogangxian mine, Hunan Province, China.” The Mineralogical Record 42(6):557–603. The major Mineralogical Record treatment of Yaogangxian, widely cited in locality records.
Peng, Jiantang, Mei-Fu Zhou, Ruizhong Hu, Nengping Shen, Shunda Yuan, Xianwu Bi, Andao Du, and Wenjun Qu. 2006. “Precise molybdenite Re–Os and mica Ar–Ar dating of the Mesozoic Yaogangxian tungsten deposit, central Nanling district, South China.” Mineralium Deposita 41:661–669. Establishes the timing of mineralization using molybdenite Re–Os and hydrothermal mica Ar–Ar dating, including muscovite.
Wang, Xiang, and Minghua Ren. 2018. “Constraints of Hydrothermal and Magmatic Zircon on the Origin of the Yaogangxian Tungsten Deposit, Southern China.” Ore Geology Reviews 101:453–467. Discusses zircon from wolframite-bearing quartz veins and muscovite alkali-feldspar granite.
Li, Wen-Sheng, Pei Ni, Jun-Yi Pan, Guo-Guang Wang, Li-Li Chen, Yu-Long Yang, and Jun-Ying Ding. 2018. “Fluid inclusion characteristics as an indicator for tungsten mineralization in the Mesozoic Yaogangxian tungsten deposit, central Nanling district, South China.” Journal of Geochemical Exploration 192:1–17. Useful for the fluid history of Yaogangxian’s wolframite-quartz and scheelite-skarn mineralization.
Li, Wen-Sheng, Pei Ni, Jun-Yi Pan, Stefano Albanese, Benedetto De Vivo, Rosario Esposito, and Jun-Ying Ding. 2023. “The genetic association between vein and skarn type tungsten mineralization in the Yaogangxian tungsten deposit, South China: Constraints from LA-ICP-MS analysis of individual fluid inclusion.” Ore Geology Reviews 159:105544. A modern study addressing the relationship between Yaogangxian’s vein and skarn tungsten systems.
Lin, Chuanxian, Zheru Zhang, and Donald Burt. 1985. “Phase equilibria of several tungsten deposits in southern China.” Geochemistry 4(3):280–290. Regional phase-equilibria paper that explicitly includes Yaogangxian and discusses muscovite-bearing assemblages in greisen-related systems.
Mindat occurrence page: Muscovite from Yaogangxian Mine. The primary online occurrence record for muscovite at the locality, with photo and reference aggregation.
“Fluorite-Muscovite-235566.jpg” — Rob Lavinsky, iRocks.com, via Wikimedia Commons. A sharp purple fluorite crystal on muscovite matrix from Yaogangxian.
“Fluorite-Muscovite-41480.jpg” — Rob Lavinsky, iRocks.com, via Wikimedia Commons. A gemmy fluorite cube with purple phantom on sparkly green muscovite.
“Fluorite-Quartz-Muscovite-41661.jpg” — Rob Lavinsky, iRocks.com, via Wikimedia Commons. A large fluorite-quartz-muscovite combination illustrating the locality’s green mica matrix style.
“Scheelite; mica.jpg” — Géry Parent via Wikimedia Commons. Scheelite on muscovite from Yaogangxian, useful for recognizing the scheelite-mica association.
EarthWonders specimen page: “Fluorite with Muscovite.” A recent marketplace example of blue-purple zoned fluorite on tan, bubbly muscovite matrix.
EarthWonders specimen page: “Fluorite on Muscovite.” A miniature showing phantom-rich fluorite on translucent yellowish muscovite.
Mindat locality page for Yaogangxian Mine — The best single locality reference for coordinates, deposit summary, mineral list, historical notes, and cautions on disputed species.
Mindat muscovite occurrence page for Yaogangxian Mine — Focused occurrence record for muscovite from the mine, with associated species and reference links.
Minfind locality article: Yaogangxian Mine, Yizhang County, Chenzhou, Hunan Province, China — Collector-oriented locality overview with further-reading references and examples of market circulation.
Rocks & Minerals: “The Yaogangxian Tungsten Mine” — Classic Ottens and Cook article on Yaogangxian’s mining and specimen mineralogy.
Peng et al. 2006, Mineralium Deposita, repository record — Primary geochronology paper for the molybdenite and mica ages of the deposit.
Wang and Ren 2018, Ore Geology Reviews, UNLV repository record — Detailed study of zircon constraints on the origin of the Yaogangxian tungsten deposit.
Li et al. 2018, Journal of Geochemical Exploration — Fluid-inclusion work on Yaogangxian’s tungsten mineralization.
Li et al. 2023, Ore Geology Reviews, Mindat reference record — Modern reference on the genetic association between Yaogangxian’s vein and skarn tungsten mineralization.
Wikimedia Commons category: Yaogangxian Mine — Open media repository with specimen photographs from the locality.
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