Two skarns in the Cassiar District of northern British Columbia are characterized by the presence of up to 0.9 percent SnO 2 in a unique iron-rich silicate assemblage of andradite, epidote, ferroactinolite, and hedenbergite. No normal tin minerals are present, and indications are that tin is principally in the lattice of garnet and epidote, probably as Sn (super 4+) substituting for Fe (super 3+) .
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