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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Anorthite from
Hercules Leg Cave, Lava Beds National Monument, Siskiyou County, California, USA


Locality type:Cave
Classification
Species:Anorthite
Formula:Ca(Al2Si2O8)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Anorthite data
Locality Data:Click here to view Hercules Leg Cave, Lava Beds National Monument, Siskiyou County, California, USA
Data Identifiers
Mindat Occurrence Record ID:1865167
Long-form Identifier:1:3:1865167:8
GUID (UUID V4):0
References
Bower, Dina M.; McAdam, Amy C.; Yang, Clayton S. C.; Jin, Feng; Millan, Maeva; Christiann, Clara; Mussetta, Mathilde; Knudson, Christine; Jarvis, Jamielyn; Johnson, Sarah; et al. (2025) Minerals as Windows into Habitability on Lava Tube Basalts: A Biogeochemical Study at Lava Beds National Monument, CA. Minerals, 15 (12). doi:10.3390/min15121303
 
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