What is "gatehouseite"

n. (context mineral English) A mineral containing hydrogen, manganese, oxygen, and phosphorus.

Gatehouseite is a manganese hydroxy phosphate mineral with formula Mn(PO)(OH). First discovered in 1987, it was identified as a new mineral species in 1992 and named for Bryan M. K. C. Gatehouse (born 1932). , it is known from only one mine in South Australia.