Cryptomelane : K(Mn4+7Mn3+)O16
Quartz : SiO2
As recorded:
Ste Barbe vein, Montmins mining district, Échassières, Vichy, Allier, Auvergne-Rhône-Alpes, France
61mm x 49mm x 44mm
Collected by:
Photo added to mindat.org
“Film of grey-steel Cryptomelane covering and imitating the underlying quartz.
Myself collected: August 30, 2016”
Pascal Ollic - 16th October 2017
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