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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Calcite from
Ferguson Quarry, Marshall County, Iowa, USA


Locality type:Quarry
Classification
Species:Calcite
Formula:CaCO3
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Calcite data
Locality Data:Click here to view Ferguson Quarry, Marshall County, Iowa, USA
Data Identifiers
Mindat Occurrence Record ID:570202
Long-form Identifier:1:3:570202:2
GUID (UUID V4):0
Nearest other occurrences of Calcite
49.3km (30.7 miles) ⓘLimestone quarry, Poweshiek County, Iowa, USA
54.8km (34.0 miles) ⓘSteamboat Rock area, Hardin County, Iowa, USA
63.9km (39.7 miles) ⓘCalcite locality, Pella, Marion County, Iowa, USA
67.4km (41.9 miles) ⓘWaterloo South mine, Black Hawk County, Iowa, USA
72.7km (45.2 miles) ⓘKeswick quarry, Keswick, Keokuk County, Iowa, USA
75.8km (47.1 miles) ⓘJaben Quarry, Vinton, Benton County, Iowa, USA
76.3km (47.4 miles) ⓘPershing area, Marion County, Iowa, USA
79.2km (49.2 miles) ⓘPint's Quarry, Raymond, Black Hawk County, Iowa, USA
79.2km (49.2 miles) ⓘPeske Quarry, Raymond, Black Hawk County, Iowa, USA
81.1km (50.4 miles) ⓘSwanson mine, Knoxville, Marion County, Iowa, USA
References
Econ Geol (1989) 84:2139-2154
 
and/or  
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