n. A plagioclase feldspar, the first member of the Albite-Anorthite solid solution series.
the GNU version of the Collaborative International Dictionary of English
n. A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See feldspar.
The Century Dictionary and Cyclopedia
n. A triclinic soda feldspar; a common mineral, usually white or nearly white, occurring in crystals and in cleavable masses in granite veins, also as a constituent of many crystalline rocks, as diorite and some kinds of granite. See feldspar.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a widely distributed feldspar that forms rocks
Word Usage
"They've grown on a spectacular backdrop matrix of gem quartz, purple lepidolite and white albite blades."