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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Chalcocite from
Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA


05222320017381969037889.jpg
Chalcocite, etc.

Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
05222320017381969037889.jpg
Chalcocite, etc.

Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
07019590017381969032297.jpg
Chalcocite, etc.

Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
Locality type:Mine
Classification
Species:Chalcocite
Formula:Cu2S
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Malachite3
Native Copper2
Pumpellyite Subgroup2
Native Silver1
Epidote1
Calcite1
Ankerite1
Data
Mineral Data:Click here to view Chalcocite data
Locality Data:Click here to view Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
Data Identifiers
Mindat Occurrence Record ID:49006
Long-form Identifier:1:3:49006:3
GUID (UUID V4):0
Localities for Chalcocite in this Region
Baltic No. 2 shaft, Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
Nearest other occurrences of Chalcocite
1.3km (0.8 miles) ⓘBaltic No. 2 shaft, Baltic Mine, Baltic, Adams Township, Houghton County, Michigan, USA
1.8km (1.1 miles) ⓘSuperior Mine (Old Superior Mine), Superior, Portage Township, Houghton County, Michigan, USA
2.8km (1.7 miles) ⓘTrimountain Mine, Trimountain, Adams Township, Houghton County, Michigan, USA
3.0km (1.8 miles) ⓘSix Mile Hill, Adams Township, Houghton County, Michigan, USA
4.5km (2.8 miles) ⓘIsle Royal Mines, Portage Township, Houghton County, Michigan, USA
4.7km (2.9 miles) ⓘChampion Mine, Champion Mine, Adams Township, Houghton County, Michigan, USA
6.7km (4.1 miles) ⓘPortage Mine (Grand Portage Mine), Houghton, Houghton County, Michigan, USA
11.0km (6.8 miles) ⓘArcadian No. 2 shaft, Arcadian Mine, Ripley, Franklin Township, Houghton County, Michigan, USA
19.2km (11.9 miles) ⓘLa Salle Mine, Osceola Township, Houghton County, Michigan, USA
20.6km (12.8 miles) ⓘLaurium Mine, Osceola Township, Houghton County, Michigan, USA
References
Rocks & Min.: 21:664
58:109.
Buchholz, T.W., Falster, A.U., Simmons, W.B. (2010) New Data on Minerals from the Keeweenaw copper district, MI. The 37th Rochester Mineralogical Symposium, April 15-18, 2010
 
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