There are two methods to identify optic sign of biaxial indicatriz. One is based on whether the bisector of the acute angle is parallel with Ng (positi-ve) or with Np (negative),with the critical angle 2V being 90°; the other is based on the comparison of three principal refractive indezesc when Ng-Nm>Nm-Np, the optic sign is positivef when Ng一Nm
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徐济银,杲传良,1995,光轴角近90°时二轴晶光性正负的判别[J].岩石矿物学杂志,14(4):371~375. Xu Jiyin, Gao Chuanliang,1995,[J]. Acta Petrologica et Mineralogica,14(4):371~375.