Manganpyrosmalite, bustamite, and ferroan johannsenite from Broken Hill, New South Wales, Australia

Manganpyrosmalite has been found in material from Broken Hill, New South Wales, where it occurs in association with ferroan johannsenite and calcium-poor bustamite. A partial analysis of manganpyrosmalite and a complete one for johannsenite have been made, and full optical properties for the three minerals are reported. X-ray powder data are recorded in addition to a Weissenberg study of the manganpyrosmalite. Transformation of the clinopyroxene into a manganese-iron wollastonite solid solution has been effected in the laboratory and the x-ray data for these materials are given.