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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Thomsonite Subgroup from
Keweenaw Point, Grant Township, Keweenaw County, Michigan, USA


Locality type:Point
Classification
Species:'Thomsonite Subgroup' (not an IMA approved species)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Thomsonite Subgroup data
Locality Data:Click here to view Keweenaw Point, Grant Township, Keweenaw County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:416690
Long-form Identifier:1:3:416690:0
GUID (UUID V4):0
Nearest other occurrences of Thomsonite Subgroup
2.6km (1.6 miles) ⓘHigh Rock Bay, Grant Township, Keweenaw County, Michigan, USA
15.2km (9.4 miles) ⓘCopper Harbor, Grant Township, Keweenaw County, Michigan, USA
17.9km (11.1 miles) ⓘLakeshore traps, Eagle Harbor Township, Keweenaw County, Michigan, USA
36.8km (22.9 miles) ⓘAshbed Mine, Copper Falls, Eagle Harbor Township, Keweenaw County, Michigan, USA
49.6km (30.8 miles) ⓘFive Mile Point, Allouez Township, Keweenaw County, Michigan, USA
53.4km (33.2 miles) ⓘSeven Mile Point, Allouez Township, Keweenaw County, Michigan, USA
55.0km (34.2 miles) ⓘKearsarge, Calumet Township, Houghton County, Michigan, USA
60.0km (37.3 miles) ⓘNo. 2 shaft, Osceola Mine, Osceola, Calumet Township, Houghton County, Michigan, USA
60.2km (37.4 miles) ⓘNo. 3 shaft, Osceola Mine, Osceola, Calumet Township, Houghton County, Michigan, USA
61.8km (38.4 miles) ⓘTamarack Waterworks Beach, Calumet Township, Houghton County, Michigan, USA
References
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
 
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