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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Gypsum from
Mendota Mine, Illinois Mine, Georgetown District, Clear Creek County, Colorado, USA


Locality type:Mine
Classification
Species:Gypsum
Formula:CaSO4 · 2H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Gypsum data
Locality Data:Click here to view Mendota Mine, Illinois Mine, Georgetown District, Clear Creek County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:438479
Long-form Identifier:1:3:438479:3
GUID (UUID V4):0
Nearest other occurrences of Gypsum
0.1km (0.1 miles) ⓘBurleigh Mine, Illinois Mine, Georgetown District, Clear Creek County, Colorado, USA
0.8km (0.5 miles) ⓘDiamond Mine (Diamond Tunnel), Illinois Mine, Georgetown District, Clear Creek County, Colorado, USA
1.1km (0.7 miles) ⓘPayrock Mine, Illinois Mine, Georgetown District, Clear Creek County, Colorado, USA
12.6km (7.8 miles) ⓘHenderson Mine, Dailey Mining District (Jones Pass Mining District), Clear Creek County, Colorado, USA
15.9km (9.9 miles) ⓘBelcher, Nevada Gulch, Gilpin County, Colorado, USA
20.4km (12.7 miles) ⓘQuartz Hill, Central City Mining District (Central Mining District), Gilpin County, Colorado, USA
30.3km (18.8 miles) ⓘFarncomb Hill, French Gulch, Breckenridge Mining District, Summit County, Colorado, USA
35.2km (21.9 miles) ⓘGold Dust, Dunkin; Juniata; Puzzle; Ouray; Gold Dust; Washington, Breckenridge Mining District, Summit County, Colorado, USA
42.3km (26.3 miles) ⓘSchwartzwalder Mine (Ralston Creek Mine), Ralston Buttes Mining District, Jefferson County, Colorado, USA
46.6km (29.0 miles) ⓘCoon Gulch Clay Pits, Lower Clear Creek Area, Jefferson 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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