Caudaite, also known as caudaitite, is a rare mineral that belongs to the oxidized zinc-arsenic family. It was first discovered in 1868 and is named after its type locality, the Cauda Grande Mine in Piedmont, Italy. Caudaite typically occurs as small, prismatic crystals or as crusts and encrustations on host rock surfaces.
Chemically, caudaite is composed of a complex combination of elements including zinc, arsenic, oxygen, and hydrogen. Its chemical formula is usually represented as Zn5(AsO4)2(H2O)4, indicating the presence of five zinc atoms, two arsenic atoms, four water molecules, and oxygen atoms. This composition contributes to its distinctive crystal structure, making it easily identifiable under microscopic examination.
Caudaite is known for its characteristic color, which ranges from colorless to yellow or pale green, and its transparent to translucent appearance. It has a vitreous to pearly luster and a relatively low hardness on the Mohs scale, usually falling between 2.5 and 3.
Though caudaite is a relatively obscure mineral, it has some significance in mineralogy and mineral collecting due to its scarcity and distinctive crystal habit. It is usually found in association with other secondary minerals in hydrothermal ore deposit environments. While not commercially valuable, caudaite is sought after by mineral enthusiasts and collectors for its uniqueness and aesthetic appeal.
