Ernstite is a manganese iron aluminum phosphate hydrate discovered in 1970 and named for Theodore Ernst, professor of mineralogy, Erlangen University, Germany. It occurs as monoclinic, yellow-brown, radial aggregates in oxidized pegmatites; it is found as pseudomorphs after childrenite in pockets in pegmatite at the Bao Esperanza mine, Linopolis, Brazil. The type locality is Davib East Farm 61, Karibib District, Erongo Region, Namibia. Other notable localities include: Viitaniemi pegmatite, Erajarvi area, Orivesi, Finland; Linopolis, Divino das Laranjeiras, Minas Gerais, Brazil. It occurs in fracture fillings in iron formation with other phosphates at Big Fish River, Dawson mining district, Yukon Territory, Canada. In the USA, it occurs at the White Cap mine (pegmatite), Keystone, Pennington Co., South Dakota, and Palermo No. 1 mine (Palermo No. 1 pegmatite), Groton, Grafton Co., New Hampshire.
You can buy these rare yellow-brown crystals online from The Arkenstone, www.iRocks.com to add fine mineral specimens to your collection.