Orthoclase
WordNet
noun
(1) A white or colored monoclinic feldspar
WiktionaryText
Etymology
ortho + clase (from Greek klastos, broken, to break).
Noun
- Potassium aluminum silicate, KAlSi3O8, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.