Besides conventional conditions,the standardized setting of 2 lattice for compute identi- fication of minerals lays on extra restrictions which are:(1)c<><><β≤120°for="" monocliniic="">orthorhombic 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 c<>a,β角在90°—120°之间;三斜晶系要求 c<>
