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.

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