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.-any fossil wood which exhibits traces of having belonged to the pine family.-a sweet white crystalline substance extracted from the gum of a species of pine (pinus lambertina). it is isomeric with, and resembles, quercite.