Biotite : K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mindat locality:
Photo added to mindat.org
“Black biotite in matrix of quartz. Collected by Dan Stephens, Rolf Luetcke specimen and photo.”
Rolf Luetcke - 19th April 2019
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