Anhydrite occurrence, Huanquarque, Arequipa, Peru

Anhydrite forms irregular concretions with a thin milky white crust, commonly up to about 15 cm in diameter. It comes from sedimentary rocks at Huanquarque, near Aplao, 65 km NNE of Camana, in Arequipa department. Anhydrite colour is blue-gray, density 2.96, hardness 3.5, refr. index 1.55.

Ref: J. Hyrsl, Gemstones of Peru, 2012, p. 35

Gemstone List

Copyright © Jolyon & Katya Ralph 1993-2023. Site Map. Photographs are copyright of the individuals who submitted them. For more information please contact the . is an online information resource dedicated to providing free gemmological information to all.