Anorthite is a rare feldspar and its only real use is as specimens for collectors. Found in igneous rocks and in contact metamorphic limestone, notable occurrences include Lake County, California; Franklin, New Jersey; Italy; and the earths moon.

What rock is anorthite found in?

Anorthite is a rare compositional variety of plagioclase. It occurs in mafic igneous rock. It also occurs in metamorphic rocks of granulite facies, in metamorphosed carbonate rocks, and corundum deposits. Its type localities are Monte Somma and Valle di Fassa, Italy.

What mineral is like anorthite?

Albite is one end member, containing sodium and no calcium. The other end member, Anorthite, contains calcium and no sodium. The intermediary members are Oligoclase, Andesine, Labradorite, and Bytownite. Labradorite and Bytownite are considered by some to be a variety of Anorthite rather then a separate mineral.