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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Werdingite from
Cap Andrahomana, Andranobory, Taolagnaro District, Anosy, Madagascar


Locality type:Outcrop
Classification
Species:Werdingite
Formula:(Mg,Fe)2Al14Si4B4O37
Comments:Be-werdingite, replaces sillimanite.
Found as inclusions in grandidierite or garnet, or as grains 0,05-5mm long and 0,1-2 mm across or as 0,1-2 mm graisn replacing sillimanite.
Colour:Shows yellow pleochroism
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Werdingite data
Locality Data:Click here to view Cap Andrahomana, Andranobory, Taolagnaro District, Anosy, Madagascar
Data Identifiers
Mindat Occurrence Record ID:27642
Long-form Identifier:1:3:27642:7
GUID (UUID V4):0
References
Grew, Edward S., Yates, Martin G., Huijsmans, Joep P. P., McGee, James J., Shearer, Charles K., Wiedenbeck, Michael, Rouse, Roland C. (1998) Werdingite, a borosilicate new to granitic pegmatites. The Canadian Mineralogist, 36 (2) 399-414
 
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