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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Osumilite-(Mg) from
Tieveragh, Cushendall, County Antrim, Northern Ireland, UK


Locality type:Hill
Classification
Species:Osumilite-(Mg)
Formula:K◻2Mg2Al3[Al2Si10O30]
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Osumilite-(Mg) data
Locality Data:Click here to view Tieveragh, Cushendall, County Antrim, Northern Ireland, UK
Data Identifiers
Mindat Occurrence Record ID:92153
Long-form Identifier:1:3:92153:6
GUID (UUID V4):0
References
Chinner, G. A., Dixon, P. D. (1973) Irish osumilite. Mineralogical Magazine, 39 (302) 189-192 doi:10.1180/minmag.1973.039.302.06
American Mineralogist (1974) 59, 383 (abstract of Chinner & Dixon (1973), plus comments by Joe Mandarino)
Embrey, Peter G. (1978) Fourth supplementary list of British minerals. Mineralogical Magazine, 42 (322) 169-177 doi:10.1180/minmag.1978.042.322.01
 
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