Columbite-(Fe) : Fe2+Nb2O6
Muscovite : KAl2(AlSi3O10)(OH)2
5cm x 2.7cm x 0.3cm
weight: 2g
Photo added to mindat.org
“Doubly-terminated columbite-(Fe) crystal in muscovite.”
Harold Moritz - 28th May 2010
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