harstigite

Century Dictionary and Cyclopedia

1. n. A silicate of aluminium, manganese, calcium, and magnesium, occurring in yellow to brown orthorhombic crystals at the Harstig mine, Paysberg, Sweden.

Wiktionary

1. n. mineralogy An orthorhombic-dipyramidal mineral containing beryllium, calcium, hydrogen, manganese, oxygen, and silicon.