【摘要】 钙芒硝是盐类矿床中的常见矿物,光轴角小(2V=7°)一直是钙芒硝的重要鉴定特征之一。笔者研究表明:该矿床中钙芒硝的光轴角(2V)除大量为7°左右外,还有相当部分可从10°一直连续变化到接近40°。此发现对盐类矿物的鉴定具现实意义,2V变化等问题的深入研究,有助于查明盐类矿床的形成条件和沉积机理。更多还原

【Abstract】 Glauberite is a common mineral in salt deposits. Small optical angle ( 2V = 7° ) is one of the most important diagnostics for glauberite identification. We worked on a salt deposit in Anning , Yunnan 1983,and found some changes in optic angle of glauberites.The preliminary studies show that some of the glauberites have a series of optical angle changes ranging from 10* to 40*, though majority of them are 7* in this deposit. This discovery is important for identifying salt minerals. The study of the change of 2V may throw a light upon the forming conditions and recipitation mechanism of salt deposits.更多还原