Biotite : K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
50mm x 30mm x 27mm
Photo added to mindat.org
“Interesting biotite book in matrix, 50 x 30 x 27 mm. Collected in 1974 by Clyde Hardin at the Branch locality. His notes call it "annite". K. Nash specimen and photo. ”
Kelly Nash - 14th January 2012
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