“美国苹果绿”的宝石学特征及矿物组成

近几年,珠宝市场上出现了一种＂美国苹果绿＂新玉石产品,其主要作为摆件和雕件销售,日益受到消费者的欢迎。＂美国苹果绿＂为苹果绿色,有的可见大小不同的白色斑点,折射率为1.560,密度为2.555g/cm3,与磷铝石的折射率（约1.560）和密度（2.500±0.080g/cm3）相近。通过常规宝石学检测、激光诱导离解光谱（LIBS）、红外吸收光谱和X射线粉末衍射等测试方法,确认该样品的主要矿物组成为磷铝石,含少量的磷钙铝石,白色斑点的主要矿物组成为隐晶质石英。初步断定,＂美国苹果绿＂应为产自美国的绿磷铝石。

Gemmological Characteristics and Mineral Components of ＂American Apple-Green＂ Jade

A new kind of jade product named ＂American apple-green＂ has appeared on gem market recently,which is mainly sold as ornaments and carvings,and is increasingly more and more popular.The colour of the jade is apple green,and some have white spots in different sizes on the surface. Its refractive index is 1.560 and the density is 2.555 g/cm3,which are very similar to that （respectively 1.560 and 2.500±0.080 g/cm3）of variscite. Through the conventional gemmological testing,Laser-induced breakdown spectroscopy（LIBS）,Infrared absorption spectra and X-ray powder diffraction,it is confirmed that the main mineral component of the ＂American apple-green＂ sample is variscits with a small amound of woodhouseite,and the main mineral component of the white spots is cryptocrystalline quartz.Therefore,it is initially determined that the ＂American apple-green＂ jade could be green variscite from the United States.