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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Pyrite from
Golden Jack Prospect (Jack Lee Mine; Golden Jack Mining Company Property), Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus County, Montana, USA


Locality type:Prospect
Classification
Species:Pyrite
Formula:FeS2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyrite data
Locality Data:Click here to view Golden Jack Prospect (Jack Lee Mine; Golden Jack Mining Company Property), Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus County, Montana, USA
Data Identifiers
Mindat Occurrence Record ID:788436
Long-form Identifier:1:3:788436:8
GUID (UUID V4):0
Nearest other occurrences of Pyrite
6.9km (4.3 miles) ⓘGeis Mine (Red Metal Claim group; Gies Mine; Elk Peak project; Bertha claim group), Cone Butte Sub-District, Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus County, Montana, USA
14.7km (9.1 miles) ⓘBlack Bull Mine (Globe Mine), Warm Springs District (Gilt Edge District; Gold Hill District; Maiden District), Fergus County, Montana, USA
29.6km (18.4 miles) ⓘGold Queen group, North Moccasin Mining District (Kendall Mining District), Fergus County, Montana, USA
34.5km (21.5 miles) ⓘWhiteware Clay occurrence (Lewistown Kaolinite), South Moccasin Mountains, Fergus County, Montana, USA
38.6km (24.0 miles) ⓘNorth Moccasin, North Moccasin Mining District (Kendall Mining District), Fergus County, Montana, USA
82.6km (51.3 miles) ⓘGold Bug Mine, Little Rockies Mining District, Phillips County, Montana, USA
86.7km (53.9 miles) ⓘRuby Gulch Group (Ruby; Mint), Little Rockies Mining District, Phillips County, Montana, USA
98.3km (61.1 miles) ⓘShonkin Sag laccolith, Highwood Mountains, Chouteau County, Montana, USA
References
Tucker, Chris (n.d.) Personal communication.
Gobla, Michael J. (2012) Montana Mineral Locality Index. Rocks & Minerals, 87 (3) 208-240 doi:10.1080/00357529.2012.676825
 
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