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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
Archer, Gold Hill Mining District, Boulder County, Colorado, 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 Archer, Gold Hill Mining District, Boulder County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:431031
Long-form Identifier:1:3:431031:0
GUID (UUID V4):0
Nearest other occurrences of Pyrite
0.3km (0.2 miles) ⓘWashburn Mine, Sunshine, Gold Hill Mining District, Boulder County, Colorado, USA
0.4km (0.2 miles) ⓘAmerican Mine, Sunshine, Gold Hill Mining District, Boulder County, Colorado, USA
0.4km (0.3 miles) ⓘGrand View, Gold Hill Mining District, Boulder County, Colorado, USA
0.4km (0.3 miles) ⓘInterocean Mine, Gold Hill Mining District, Boulder County, Colorado, USA
0.7km (0.4 miles) ⓘOsceola, Gold Hill Mining District, Boulder County, Colorado, USA
1.2km (0.8 miles) ⓘLittle Johnny Mine (Emancipation group; Home Sweet Home occurrence), Gold Hill, Gold Hill Mining District, Boulder County, Colorado, USA
1.9km (1.2 miles) ⓘBelle of Memphis (Blackhawk; Horseshoe; Victoria; Mountain Chief; Fairfax; Olympic; Bighorn; Silver Queen; Scotia; Gowanda), Gold Hill Mining District, Boulder County, Colorado, USA
2.1km (1.3 miles) ⓘBlack Cloud, Gold Hill Mining District, Boulder County, Colorado, USA
2.2km (1.4 miles) ⓘMelvina, Gold Hill Mining District, Boulder County, Colorado, USA
2.2km (1.4 miles) ⓘIngram mine (Valley Forge Occurrence; Critic and Railroad Boy; Sunshine; Three Brothers; Atchison; Belle; Golden Eagle; Melvina; Baron; Richmond), Gold Hill Mining District, Boulder County, Colorado, USA
References
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
 
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