n. [ So called from Pini, a mine in Saxony. ] (Min.) A compact granular cryptocrystalline mineral of a dull grayish or greenish white color. It is a hydrous alkaline silicate, and is derived from the alteration of other minerals, as iolite. [ 1913 Webster ]
n. [ L. pinus the pine tree. ]
n. [ So called after Vulpino, in Italy. ] (Min.) A scaly granular variety of anhydrite of a grayish white color, used for ornamental purposes. [ 1913 Webster ]