What is "woodhouseite"

n. (context mineralogy English) A trigonal-hexagonal scalenohedral mineral containing aluminum, calcium, hydrogen, oxygen, phosphorus, and sulfur.

Woodhouseite belongs to the beudantite group AB(XO)(SO)(OH) where A = Ba, Ca, Pb or Sr, B = Al or Fe and X = S, As or P. Minerals in this group are isostructural with each other and also with minerals in the crandallite and alunite groups. They crystallise in the rhombohedral system with space group Rm and crystals are usually either tabular {0001} or pseudo-cubic to pseudo-cuboctahedral. Woodhouseite was named after Professor Charles Douglas Woodhouse (1888–1975), an American mineralogist and mineral collector from the University of California, Santa Barbara, US, and one-time General Manager of Champion Sillimanite, Inc.