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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Brianroulstonite from
Sarıkaya B deposit, Kirka, Seyitgazi District, Eskişehir Province, Turkey


Locality type:Deposit
Classification
Species:Brianroulstonite
Formula:Ca3[B5O6(OH)6](OH)Cl2 · 8H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Brianroulstonite data
Locality Data:Click here to view Sarıkaya B deposit, Kirka, Seyitgazi District, Eskişehir Province, Turkey
Data Identifiers
Mindat Occurrence Record ID:964131
Long-form Identifier:1:3:964131:0
GUID (UUID V4):0
References
Koçak, İ, Koç, Ş (2016) Geochemical characteristics of Kırka (Sarıkaya) borate deposit, northwestern Anatolia, Turkey. Journal of Earth System Science, 125 (1). 147-164 doi:10.1007/s12040-015-0646-x
(2016)
 
and/or  
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