Description
Trolleite is a relatively rare mineral of the phosphate class. It crystallizes in the monoclinic crystal system with the chemical composition Al4[OH|PO4]3 [4] and develops predominantly massive to flaky aggregates that are colorless or light blue to light green in color. The mineral was first described in 1868 by Christian Wilhelm Blomstrand (1826–1897), who named it 'Trolleit' in honor of the Swedish chemist Hans Gabriel Trolle-Wachmeister (1782–1871). Trolleite forms in metamorphic rocks such as amphibolite. So far, the mineral has been recovered in the following locations: in Bundaberg (Queensland) in Australia; in Yamaguchi Prefecture on Honshu in Japan; in the Itremo Massif of the Fianarantsoa Province of Madagascar; in the East Siberian region (Transbaikalia) of Russia; in the western province of Rwanda; in the Swedish provinces of Skåne, Värmland and Västergötland; as well as in California (White Mountains), Colorado (Glendevey) and Virginia (Sprouses Corner) in the US.
