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It's a showdown with rare earth elemental ore Monazite-(Ce) and index mineral Andalusite.
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Diorite from
Sunnyside Tunnel, Grayback Mining District (Russell Mining District), Costilla County, Colorado, USA


Locality type:Tunnel
Classification
Type:Diorite
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Diorite data
Locality Data:Click here to view Sunnyside Tunnel, Grayback Mining District (Russell Mining District), Costilla County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:1044533
Long-form Identifier:1:3:1044533:6
GUID (UUID V4):0
Nearest other occurrences of Diorite
80.5km (50.0 miles) ⓘKnight - Stacy Occurrence (Grab; Rito Alto), Rainbow Lake Mining District, Lake Creek Mining District, Custer County, Colorado, USA
84.2km (52.3 miles) ⓘGreen Mountain Mine (Copper Boy Mine), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
85.9km (53.4 miles) ⓘDawson Gold project, Fremont County, Colorado, USA
86.0km (53.4 miles) ⓘEl Plomo Mine, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
87.2km (54.2 miles) ⓘCopper Girl (Copper Girl 1906; Patented Claims: Valley View), Copper Gulch Area, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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