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Mg_2[Si_2O_6](En)-Fe_2[Si_2O_6](Fs)系列的斜方辉石成员基本上都属于Pbca空间群;除此之外,迄今仅知在两处月岩中的古铜辉石,以及两处无球粒陨石中的顽火辉石和紫苏辉石,及一处铁陨石的硅酸盐包裹体中的古铜辉石具P2_1ca空间群。虽曾有报道,在南斯拉夫Gole山的顽火辉石中有P2_1ca对称的晶畴存在,但它是与更富En组份且具Pbca对
The orthopyroxene in the Mg_2 [Si_2O_6] (En) -Fe_2 [Si_2O_6] (Fs) series belong to the Pbca space group. In addition, so far know only the ancient copper pyroxene in two lunar rocks, As well as the enstatites and peridotites in two non-chondrites and the Palaelirudite in the silicate inclusions of an iron meteorite with P2_1ca space group. Although it has been reported that P2_1ca symmetry exists in the enstatite of the Gole Mountain in Yugoslavia, it is associated with the more En-rich and Pbca-rich