This formula unit corresponds to one quarter of the unit cell for the monoclinic pyroxenes. The pyroxene formula unit calculated to six oxy¬ gens, or to four cations (Vieten and Hamm, 1978), is essential for the classification. The classification and nomenclature of the py¬ roxenes have been largely based on their crystal chemistry. These re¬ commendations have been approved by the Commission by a formal vote (20th May, 1987). The subcommittee on pyroxenes has, after a thorough evaluation of the group of pyroxene minerals, presented its recommendations for a new classification and nomenclature to the Com¬ mission on New Minerals and Mineral Names (hereafter abbreviated as C.N.M.M.N.). Non-voting Members : Kenichiro AOKI (Japan), Glauco GOTTARDI (Italy). GINZBURG (U.S.S.R.), Malcolm ROSS (U.S.A.), Friedrich A. Nobuo MORIMOTO, Chairman Department of Geology and Mineralogy, Kyoto University, Kyoto 606, Japan.
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