Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Pyrite from
Stillwater Mine (Johns-Manville Stillwater Platinum; Stillwater PGM Resources; Stillwater Platinum Project; M Prospect), Sweet Grass County, Montana, USA


Locality type:Mine
Classification
Species:Pyrite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyrite data
Locality Data:Click here to view Stillwater Mine (Johns-Manville Stillwater Platinum; Stillwater PGM Resources; Stillwater Platinum Project; M Prospect), Sweet Grass County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:1833221
Long-form Identifier:1:3:1833221:4
GUID (UUID V4):0
Nearest other occurrences of Pyrite
3.2km (2.0 miles) ⓘPicket Pins prospect (Picket Pin occurrence), Sweet Grass County, Montana, USA
3.9km (2.4 miles) ⓘFrog Pond West Occurrence (J-M Reef), Sweet Grass County, Montana, USA
5.4km (3.4 miles) ⓘEast Boulder Mine, Sweet Grass County, Montana, USA
5.6km (3.5 miles) ⓘJanet 50 Occurrence, Sweet Grass County, Montana, USA
5.6km (3.5 miles) ⓘMonkey East Camp Zone Occurrence (J-M Reef), Sweet Grass County, Montana, USA
6.4km (4.0 miles) ⓘIron Mountain, Sweet Grass County, Montana, USA
11.6km (7.2 miles) ⓘWest Fork East Adit Occurrence (J-M Reef), Sweet Grass County, Montana, USA
18.5km (11.5 miles) ⓘStillwater Mine, Stillwater County, Montana, USA
25.2km (15.7 miles) ⓘBlack Diamond Prospect (War Eagle Prospect), Cowles Mining District (Haystack Mining District; Boulder Mining District; Independence Mining District), Park County, Montana, USA
25.6km (15.9 miles) ⓘSkyline Prospect (Ski Line Mine; Mtn. View No. 1 & No. 2), Independence Mining District, Sweet Grass County, Montana, USA
References
Chen, Chen; Xian, Haiyang; Jenkins, Christopher; Yao, Zhuosen; Yang, Yiping; Lin, Xiaoju; Li, Shan; Xi, Jiaxin; Yuan, Yuhuan; Zhu, Jianxi; et al. (2025) Wangyanite, PdNi8S8, a new Pd end-member mineral of the pentlandite group from the J-M reef, Stillwater Complex, Montana, USA. American Mineralogist, 110 (11). 1844-1853 doi:10.2138/am-2024-9640
 
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