Langite is a mineral that belongs to the copper sulfate mineral group. It is specifically classified as a copper hydrated sulfate carbonate and is often found in association with other copper minerals. The mineral is named after the locality where it was first discovered, which is in Cornwall, England.
In terms of physical characteristics, langite typically occurs as small, thin, prismatic crystals that can appear vitreous or pearly in luster. It commonly forms in a deep blue to greenish-blue color, which is widely regarded as one of its distinguishing features. Langite has a relatively low hardness and can be easily scratched, registering around 2.5 to 3 on the Mohs scale.
Chemically, langite consists of copper combined with sulfur, oxygen, and carbon. Its chemical formula is Cu4SO4(OH)6.4H2O, indicating that it contains four units of copper, six units of hydroxyl, and four units of water. This chemical composition gives langite its characteristic blue color, as copper is a well-known coloring agent in minerals.
Langite is primarily found in oxidized copper deposits, often occurring in association with other copper minerals such as malachite, azurite, or chalcanthite. It is commonly found in the alteration zones of copper sulfide deposits, where it forms as a secondary mineral due to the weathering and oxidation of primary copper minerals.
Due to its vivid blue color and distinctive crystal form, langite is often collected as a mineral specimen by mineral enthusiasts and collectors worldwide.
