Mica Group (Var: Lepidomelane)
Silver Crater Mine, Faraday Township, Hastings County, Ontario, Canada
5.6 x 4.3 x 3.1 cm. "Lepidomelane" is a term used for dark iron-bearing mica species, which can include annite, tetra-ferri-annite, siderophyllite, and perhaps other species too. This piece was labeled as "Ferrian Biotite", but since biotite is no longer a species, it is "used as a generic field term for any incompletely analysed dark mica" ...
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