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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Magnesio-hornblende from
Bombazine Island, Harpswell, Cumberland County, Maine, USA


Locality type:Island
Classification
Species:Magnesio-hornblende
Formula:◻Ca2(Mg4Al)(Si7Al)O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Magnesio-hornblende data
Locality Data:Click here to view Bombazine Island, Harpswell, Cumberland County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:538360
Long-form Identifier:1:3:538360:3
GUID (UUID V4):0
References
www.maine.gov/doc/nrimc/mgs/explore/bedrock/b42/harpswell.htm
 
and/or  
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