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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Chalcopyrite 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:Chalcopyrite
Formula:CuFeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcopyrite 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:638245
Long-form Identifier:1:3:638245:2
GUID (UUID V4):0
Nearest other occurrences of Chalcopyrite
3.2km (2.0 miles) ⓘPicket Pins prospect (Picket Pin occurrence), Sweet Grass County, Montana, USA
3.9km (2.4 miles) ⓘChrome Mountain Ni-Cu Occurrence, Sweet Grass County, Montana, USA
3.9km (2.4 miles) ⓘFrog Pond West Occurrence (J-M Reef), Sweet Grass County, Montana, USA
4.2km (2.6 miles) ⓘForge Ni-Cu Occurrence (Boulder Forge; Placer Basin), 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
5.7km (3.6 miles) ⓘBoulder River Ni-Cu East Occurrence, Sweet Grass County, Montana, USA
5.8km (3.6 miles) ⓘIron Mountain Ni-Cu Camp Occurrence, Sweet Grass County, Montana, USA
6.4km (4.0 miles) ⓘIron Mountain, Sweet Grass County, Montana, USA
References
www.mining-technology.com/projects/stillwater
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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