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
Rockland-Thomaston "Limestone" quarries, Rockland, Knox County, Maine, 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 Rockland-Thomaston "Limestone" quarries, Rockland, Knox County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:42664
Long-form Identifier:1:3:42664:2
GUID (UUID V4):0
Nearest other occurrences of Calcite
0.2km (0.1 miles) ⓘNellie Ulmer Marble Quarry, Thomaston, Knox County, Maine, USA
1.6km (1.0 miles) ⓘOld County Road locality, Thomaston, Knox County, Maine, USA
2.6km (1.6 miles) ⓘDragon Cement Quarry, Thomaston, Knox County, Maine, USA
10.9km (6.8 miles) ⓘStarrett Quarries, Warren, Knox County, Maine, USA
35.0km (21.7 miles) ⓘDeer Isle Mine, Deer Isle, Hancock County, Maine, USA
38.0km (23.6 miles) ⓘCape Rosier Mine (Callahan Mine; Rosier Consolidated Mine), Brooksville, Blue Hill - Castine Mining District, Hancock County, Maine, USA
52.1km (32.4 miles) ⓘDouglass Copper Mine, Blue Hill, Blue Hill - Castine Mining District, Hancock County, Maine, USA
61.5km (38.2 miles) ⓘWinslow Tin mine, Winslow, Kennebec County, Maine, USA
65.5km (40.7 miles) ⓘBasin Quarry, Phippsburg, Sagadahoc County, Maine, USA
79.3km (49.3 miles) ⓘBangor Quarry, Bangor, Penobscot County, Maine, USA
References
King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey.
 
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