Besides conventional conditions,the standardized setting of 2 lattice for compute identi- fication of minerals lays on extra restrictions which are:(1)corthorhombic system.
为满足计算机检索的需要,新的晶胞选取原则对低级晶族矿物额外增加了限制条件,斜方晶系要求满足不等式 ca,β角在90°—120°之间;三斜晶系要求 c
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