Moonstone is a kind of Feldspar gems of Feldspar. Feldspar and quartz are very common and very important minerals in the earth's crust. According to the characteristics of feldspar, it can be divided into Orthoclase and Plagioclase. Moonstone is a kind of orthoclase, с показател на пречупване на 1.518-1.526, разлика в двойното пречупване на 0.005, a [...]
