Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Anthophyllite from
Marion Mine, Custer County, Colorado, USA


Locality type:Mine
Classification
Species:Anthophyllite
Formula:◻Mg2Mg5(Si8O22)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Anthophyllite data
Locality Data:Click here to view Marion Mine, Custer County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:430490
Long-form Identifier:1:3:430490:6
GUID (UUID V4):0
Nearest other occurrences of Anthophyllite
2.7km (1.6 miles) ⓘAmethyst Prospect, Custer County, Colorado, USA
48.0km (29.8 miles) ⓘDawson Gold project, Fremont County, Colorado, USA
48.9km (30.4 miles) ⓘHorseshoe Mine (School Section Deposit), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
49.3km (30.7 miles) ⓘEl Plomo Mine, Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
49.5km (30.8 miles) ⓘGreen Mountain Mine (Copper Boy Mine), Grape Creek Mining District (Greenhorn Mining District), Fremont County, Colorado, USA
51.2km (31.8 miles) ⓘRussell, Trinchera Range, Costilla County, Colorado, USA
68.2km (42.4 miles) ⓘCotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
89.5km (55.6 miles) ⓘMill Gulch Mine, Guffey Mining District, Park County, Colorado, USA
93.1km (57.8 miles) ⓘCopper King Mine (Copper Queen Mine), Guffey Mining District, Park County, Colorado, USA
93.5km (58.1 miles) ⓘBetty Mine (Lone Chimney Mine; Betty Lowe), Guffey Mining District, Park County, Colorado, USA
References
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
Berke, Edward H., Spry, Paul G., Heimann, Adriana, Teale, Graham S., Johnson, Benjamin, von der Handt, Anette, Alers, Brian, Shallow, John M. (2023) The genesis of metamorphosed Paleoproterozoic massive sulphide occurrences in central Colorado: geological, mineralogical and sulphur isotope constraints. Geological Magazine, 160 (7) 1345-1375 doi:10.1017/s0016756823000407
 
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