Sanidine

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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}.
     [1913 Webster]