美国“云母玉”的宝石学特征  

The Gemological Characteristics of American "Mica Jade"

作　　者：朱红伟[1,2] 孙冰 燕菲[1,2] 王萍 赵潇雪[1,2] 

机构地区：[1]国家黄金钻石制品质量监督检验中心,济南250014 [2]山东省社会公正计量行,济南250014

出　　处：《超硬材料工程》2017年第4期64-66,共3页Superhard Material Engineering

摘　　要：近期,商场上出现一种商业名称为美国"云母玉"的红色玉石,通过基本宝石学测试、红外光谱仪测试、激光剥蚀电感耦合等离子体质谱仪测试、紫外—可见光光谱仪检测,结果显示:该种玉石为粒状集合体,呈现浅紫红色,玻璃光泽,不透明,点测折射率为1.70,相对密度为2.55,硬度在4左右。红外光谱测试,样品具有[PO_4]^(3-)的反对称变角振动所致的吸收峰1014cm^(-1),[PO_4]^(3-)的变角对称振动所致的吸收峰550cm^(-1),[PO_4]^(3-)弯曲振动所致的吸收峰585 cm^(-1),结晶水的弯曲振动所致的吸收峰1627 cm^(-1),结晶水对称伸缩振动所致的吸收峰3388 cm^(-1)。紫外—可见光光谱仪测试,具有530nm宽大吸收峰,说明样品的颜色主要由铁引起。通过上述测试,表明样品的矿物名称为斜红磷铁矿。Recently, a red jade called American ＂ mica jade＂ appears on the market. Result of the basic gemmological test, infrared spectrometer test and laser ablation inductively coupled plasma mass spectrometry test and UV-visible spectroscopy detection show that this kind of jade is a opaque granular aggregate in purplish red color with vitreous luster.It has a refractive index of 1. 70, a relative density of 2. 55 and a hardness of about 4. Infrared spectrometer test shows that the sample has an absorption peak 1014cm^1 caused by antisymmetric variable angle vibration of [PO_4]~3, an absorption peak 550cm^1 caused by variable angle symmetric vibration of [PO_4]~3, an absorption peak 585 cm^1 caused by bending vibration of [PO_4]~3, an absorption peak 1 627 cm^1 caused by bending vibration of crystal water and an absorption peak 3388 cm^1 caused by symmetrical stretching vibration of crystal water. UV-visible spectroscopy detection shows that the sample has a530 nm broad absorption peak which indicates that the color of it is mainly caused by iron.All the above tests demonstrate that the mineral name of the sample should be chinostrengite. Keywords： American mica jade; identification; chinostrengite

关 键 词：美国云母玉 鉴定 斜红磷铁矿 

分 类 号：TS933[轻工技术与工程]