Anhydrite gets its name from the Greek word “anhydrous” which translates to “without water”. If anhydrite is exposed to humidity or water, it readily alters to gypsum. It is often fibrous and takes on the appearance of fan-like groupings. It can also form cubes. When it is massive it is hard to distinguish from it from calcite, gypsum, or halite.
- Optical Properties
- Characteristic Physical Properties
- Chemistry & Crystallography
Countries of Origin
Papua New Guinea; Angola; Kazakhstan; Portugal; Greece; Mongolia; Morocco; Unknown; Mali; Panama; Guatemala; Iraq; Chile; Argentina; Ukraine; Zambia; India; Canada; Turkey; Belgium; Namibia; Finland; South Africa; Georgia; Peru; Turkmenistan; Germany; Tanzania, United Republic Of; Fiji; Viet Nam; Madagascar; Thailand; Costa Rica; Sweden; Russian Federation (the); Poland; Bulgaria; Jordan; United States Minor Outlying Islands (the); Tunisia; Kenya; Switzerland; Spain; Djibouti; Cuba; Burkina Faso; Lao People's Democratic Republic (the); Israel; Australia; Tajikistan; Myanmar; Malaysia; Iceland; Oman; Armenia; Austria; Mozambique; El Salvador; Brazil; Algeria; Slovenia; Colombia; Ecuador; Iran (Islamic Republic of); Hungary; Congo (the); Japan; Taiwan (Province of China); Bolivia (Plurinational State of); New Zealand; Vanuatu; Italy; Antarctica; Ethiopia; Afghanistan; Czechia; Egypt; Malta; Saudi Arabia; Pakistan; China; Ireland; Qatar; Slovakia; France; Lithuania; Serbia; Kyrgyzstan; United Kingdom of Great Britain and Northern Ireland (the); Romania; Dominican Republic (the); Uzbekistan; Netherlands (the); Norway; Denmark; Mexico; Zimbabwe; Philippines (the); Greenland; Indonesia
Special care needs to be taking with anhydrite because it is brittle with perfect cleavage and will alter to gypsum if exposed to water.