Word Study
cassiterite
CIDE DICTIONARY
cassiterite, n. [Gr. tin.].
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]
OXFORD DICTIONARY
cassiterite, n. a naturally occurring ore of tin dioxide, from which tin is extracted. Also called TINSTONE.
Etymology
Gk kassiteros tin
For further exploring for "cassiterite" in Webster Dictionary Online