Anhydrite

Part of speech: noun

Definitions

1. A mineral composed primarily of calcium sulfate, often found in sedimentary environments and typically occurring in massive forms
2. This naturally occurring mineral lacks water in its crystalline structure, often appearing as a white or gray solid in geological formations
3. Characterized by its anhydrous composition, this sulfate mineral is associated with evaporitic deposits and can transform into gypsum under certain conditions

Etymology: Anhydrite is a compound built from Greek parts, and its name records a chemical fact: the mineral is calcium sulfate with no water in it. The prefix comes from Ancient Greek "ănhudros" (dry), formed from the privative "a-" or "an-" meaning "without" and "hydor," water. English "hydro-" comes from the same Greek root, which is why the word sounds like a water-related term. The core of the name is the element "hydro-", joined to the suffix "-ite," which English uses for minerals and other substances. The "-ite" ending traces back through Latin "-ites" and Greek "-itēs," originally forming adjectives and nouns linked to a place or material. Mineral names built this way became common in the 1700s and 1800s as chemists and geologists classified substances. Anhydrite was named to contrast it with gypsum, which contains water. Gypsum is a hydrated form of the same compound, so the name marks the difference in a single prefix.