Hypertext Webster Gateway: "sanidine"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Sanidine \San"i*dine\, n. [Gr. ?. ?, a board. So called in
allusion to the tabular crystals.] (Min.)
A variety of orthoclase feldspar common in certain eruptive
rocks, as trachyte; -- called also {glassy feldspar}.
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