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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Portlandite from
Jebel Awq, Ad Dakhiliyah Governorate, Oman


Locality type:Hill
Classification
Species:Portlandite
Formula:Ca(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Portlandite data
Locality Data:Click here to view Jebel Awq, Ad Dakhiliyah Governorate, Oman
Data Identifiers
Mindat Occurrence Record ID:968885
Long-form Identifier:1:3:968885:8
GUID (UUID V4):0
References
Neal, Colin, Stanger, Gordon (1984) Calcium and magnesium hydroxide precipitation from alkaline groundwaters in Oman, and their significance to the process of serpentinization. Mineralogical Magazine, 48 (347) 237-241 doi:10.1180/minmag.1984.048.347.07
 
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