Muscovite : KAl2(AlSi3O10)(OH)2
As recorded:
Willow Spring Ranch, Oracle, Oracle Mining District, Pinal County, Arizona, USA
29mm x 13mm x 10mm
Photo added to mindat.org
“Sharp, well defined muscovite pseudomorph after tourmaline (varietal name: Sericite) from a unique find. No damage, good termination. Ex. A. Stevenson collection #479a. Overall size of mineral specimen: 29x13x10 mm. Size of individual crystals: 29 mm.”
John Betts - 30th November 2000
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