Cassiterite : SnO2
Muscovite : KAl2(AlSi3O10)(OH)2
Photo added to mindat.org
“A rich specimen with many black cassiterite crystals (mainly twinned crystals) on yellow muscovite spheres.
FOV: 5 x 4 cm
Collection & photo: Alain TUEL”
Alain Tuel - 4th March 2012
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