Anorthite

[ә'nɔ:θait]

Definition

(noun.) rare plagioclastic feldspar occurring in many igneous rocks.

Checked by Francis--From WordNet

Definition

(n.) A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See Feldspar.

Typed by Dido