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 Photo courtesy of G. Robinson. Sphene (titanite)6.70 ctTilly Foster mine Brewster, Putnam County (under construction) | ||
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Source: Robinson, G.W. and Chamberlain, S.C. (2007). The Gems of New York State. Rocks and Minerals, Vol. 82, No. 6, pp. 458-463. | ||
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