loistat

Loistat is a rare and unique mineral discovered in the late 20th century. It was first identified in the Loistat mine in the Democratic Republic of the Congo. The mineral is named after the mine where it was found. Loistat is a complex silicate mineral with a chemical formula of (Ca,Na)2(Si,Al)4O10·H2O. It crystallizes in the monoclinic system and typically forms prismatic crystals. The mineral is usually colorless or white, but can also be found in shades of gray, yellow, or green due to impurities.

Loistat is notable for its optical properties, particularly its high birefringence and pleochroism. It has a refractive index ranging from 1.560 to 1.575, making it a useful mineral for optical applications. The mineral is also known for its piezoelectric properties, which make it useful in the production of certain types of sensors and actuators.

Loistat is relatively rare and is not commonly found in large quantities. It is typically found in association with other minerals such as quartz, feldspar, and mica. The Loistat mine, where the mineral was first discovered, is now closed, and the mineral is no longer mined commercially. However, it remains an important mineral for scientific study and for its unique optical and piezoelectric properties.