Definition, synonyms and related words
A mineral, of a white color and vitreous luster, with the chemical formula CaAl₂Si₄O₁₂·4H₂O. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles.
This mineral is named after the French geologist François Pierre Nicholas Gillet de Laumont, who discovered it. The name was originally spelled lomonite before being standardized to laumontite in the early 19th century.