The standard treatises on mineralogy all refer rhodonite, bustamite, fowlerite and babingtonite to the triclinic pyroxenes, but show no agreement at all regarding the other members of the group. Dana1 includes hiortdahlite in the group, but it is excluded by others because it is not a metasilicate; Hintze2 includes jadeite as a triclinic pyroxene, but other authors agree that it is monoclinic; Groth3 adds schizolite and margarosanite to the triclinic pyroxenes, but their crystallographic angles and constants differ decidedly from those of any pyroxenes.Washington and Merwin4 add sobralite, pyroxmangite and vogtite to this triclinic group of minerals, but suggest that the group should not be regarded as pyroxenes.

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