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cassiterite
From The Collaborative International Dictionary of English v.0.48:
Cassiterite \Cas*sit"er*ite\, n. [Gr. ? tin.] (Min.)
Native tin dioxide; tin stone; a mineral occurring in
tetragonal crystals of reddish brown color, and brilliant
adamantine luster; also massive, sometimes in compact forms
with concentric fibrous structure resembling wood ({wood
tin}), also in rolled fragments or pebbly (Stream tin). It
is the chief source of metallic tin. See Black tin, under
Black.
[1913 Webster]
