Hypertext Webster Gateway: "Cassiterite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
cassiterite
n : a hard heavy dark mineral that is the chief source of tin
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