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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Pyrochlore Group from
St Peters Dome, Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA


07539310017339893176442.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
03657810017364439167711.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
06187910017364439161964.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
07539310017339893176442.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
03657810017364439167711.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
06187910017364439161964.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
07539310017339893176442.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
03657810017364439167711.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
06187910017364439161964.jpg
Pyrochlore Group, etc.

St Peters Dome, Cheyenne Mining District, El Paso County, Colorado, USA
Locality type:Dome
Classification
Species:'Pyrochlore Group' (not an IMA approved species)
Formula:A2Nb2(O,OH)6Z
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Zircon3
- var Cyrtolite3
Data
Mineral Data:Click here to view Pyrochlore Group data
Locality Data:Click here to view St Peters Dome, Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:34937
Long-form Identifier:1:3:34937:0
GUID (UUID V4):0
Localities for Pyrochlore Group in this Region
Unnamed pegmatite, St Peters Dome, Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA
Nearest other occurrences of Pyrochlore Group
0.1km (0.0 miles) ⓘCheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA
2.0km (1.2 miles) ⓘSt Peters Dome Fluorite Prospect (Duffields; Leyte; Hughes Boss; Mattie B; Colorado; Cather Springs; Timberline), Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA
2.2km (1.4 miles) ⓘStove Mountain (Cookstove Mountain), El Paso County, Colorado, USA
2.8km (1.7 miles) ⓘRosa No. 1 trench, Mount Rosa, El Paso County, Colorado, USA
3.2km (2.0 miles) ⓘMount Rosa, El Paso County, Colorado, USA
3.3km (2.1 miles) ⓘStove Mountain Mineral Locality (Cook Stove Mountain Mineral Locality), Cheyenne Mining District (St. Peters Dome Mining District), El Paso County, Colorado, USA
6.4km (4.0 miles) ⓘSpecimen Rock, El Paso County, Colorado, USA
15.3km (9.5 miles) ⓘPikes Peak, El Paso County, Colorado, USA
33.7km (20.9 miles) ⓘBlack Cloud Mine, Teller County, Colorado, USA
45.2km (28.1 miles) ⓘMica Lode Mine (Mica Hill Mine), Eight Mile Park Pegmatite Mining District, Fremont 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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