tinstone


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tin·stone

 (tĭn′stōn′)

tinstone

(ˈtɪnˌstəʊn)
n
(Minerals) another name for cassiterite

cas•sit•er•ite

(kəˈsɪt əˌraɪt)

n.
a brown or black mineral, tin dioxide, SnO2, usu. found as fibrous masses or placer deposits; the chief ore of tin.
[1855–60; < Greek kassíter(os) tin + -ite1]