一种黑色普通角闪石玉的宝石学特征

传统意义上的墨玉是指黑色软玉,其颜色由内部石墨包裹体造成。软玉市场上常出现一种被称为"墨玉"的玉石,为黑色,有白色点状区域,折射率为1.63(点测),密度为3.09g/cm3,与软玉的折射率(1.61)和密度(3.00g/cm3)相近。通过研究该玉石发现,其黑色不是由于含有石墨造成,其主要成分为深绿色的普通角闪石。因此,该玉石不应称为墨玉,而应命名为普通角闪石玉或角闪石玉。

Gemmological Characteristics of Black Hornblende Jade

Traditionally,"ink" jade is black nephrite, whose colour is caused by the graphite as its inclusion. A kind of "black jade "is often encountered in market, whose appearance, refractive index and density are almost close to that of the black nephrite. In this article, the "black jade "is studied, and it is found out that the main composition is dark green hornblende, so the jade must not be named "ink" jade but hornblende jade.