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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Sillimanite from
Sedalia Mine (Sedalia Copper Mine), Sedalia Mining District, Chaffee County, Colorado, USA


Locality type:Mine
Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Sedalia Mine (Sedalia Copper Mine), Sedalia Mining District, Chaffee County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:34316
Long-form Identifier:1:3:34316:3
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
3.9km (2.5 miles) ⓘAce High - Jackpot Prospect, Turret Mining District, Chaffee County, Colorado, USA
5.2km (3.3 miles) ⓘIndependence Mine, Turret Mining District, Chaffee County, Colorado, USA
8.1km (5.0 miles) ⓘCalumet Mine, Turret Mining District, Chaffee County, Colorado, USA
17.9km (11.1 miles) ⓘCinderella, Chaffee County, Colorado, USA
38.1km (23.7 miles) ⓘMine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
38.1km (23.7 miles) ⓘCotopaxi Mine (Cotopaxi lode; Gumaer Mine; Fannie lode; Fannie Mill), Mine Gulch, Cotopaxi, Cotopaxi Mining District, Fremont County, Colorado, USA
40.1km (24.9 miles) ⓘBon Ton Mine, Monarch Mining District, Chaffee County, Colorado, USA
41.3km (25.7 miles) ⓘDevil's Hole Mine, Fremont County, Colorado, USA
43.5km (27.0 miles) ⓘBetty Mine (Lone Chimney Mine; Betty Lowe), Guffey Mining District, Park County, Colorado, USA
46.6km (29.0 miles) ⓘFive Points Gulch, Fremont County, Colorado, USA
References
U.S. Geological Survey Professional Paper 829
Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.
The Canadian Mineralogist Vol. 43, pp. 601-622 (2005)
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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