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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Gehlenite from
Lord Hill Quarry (Lord Hill Mine), Stoneham, Oxford County, Maine, USA


Locality type:Quarry
Classification
Species:Gehlenite
Formula:Ca2Al[AlSiO7]
Comments:An obviously improbable species in a granite pegmatite or its schist host rocks. Typographical error or slip of the pen for gahnite?
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Gehlenite data
Locality Data:Click here to view Lord Hill Quarry (Lord Hill Mine), Stoneham, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:790669
Long-form Identifier:1:3:790669:5
GUID (UUID V4):0
References
Bastin, E. S. (1911) Geology of the pegmatites and associated rocks of Maine, including feldspar, quartz, mica, and gem deposits. Bulletin 445. US Geological Survey doi:10.3133/b445
 
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