Eastonite (rare mica - Type Locality) & Tremolite

Item Description

Eastonite is a rare Mica Group species and this showy and rich combination piece is from the Type Locality. Massive, sparkly tan eastonite micro plates are nicely complimented by the veins of fibrous, white tremolite on both sides of the piece. Probably older material, but no proof as the quarry closed in the 1940s. "Note that most, if not all, 'eastonite' from this locality is in fact a mixture of phlogopite and serpentine. There are no modern analysis confirming the presence of eastonite in Easton. See Livi and Veblen (1987) "Eastonite" from Easton, Pennsylvania: A mixture of phlogopite and a new form of serpentine, American Mineralogist, 72, 113-125". (MINDAT). Seldom on the market.