金黄色葡萄石的宝石学特征

Gemological characteristics of golden yellow prehnite

葡萄石,因其优质的品质受到人们的喜爱,但市面上出现的金黄色葡萄石尚未有人对其致色机理作出系统研究。选取6个葡萄石样品,其中2个为黄绿色,4个为金黄色,通过常规鉴定仪器、傅里叶红外光谱仪、紫外-可见分光光度计、X射线荧光光谱仪系统地对葡萄石样品进行测试分析,研究其致色机理。测试结果表明,黄绿色葡萄石较金黄色葡萄石,在580 nm处存在宽吸收峰,而金黄色葡萄石在200~450 nm处的吸收更强。葡萄石的颜色成因与Fe元素价态相关,Mn元素可能存在影响。

Prehnite is loved by people for its high quality,but no one has systematically studied the color-causing mechanism of golden yellow prehnite in the market.Six prehnite samples,two yellow-green and four golden yellow ones,are systematically tested and analyzed by conventional identification instruments,fourier transform infrared spectrometer,ultravioletvisible spectrophotometer and X-ray fluorescence spectrometer.The mechanism of colouration mechanism of the prehnit isstudied.The test result shows that the absorption peak of yellow-green prehnite is wider at 580 nm than that of yellow-green prehnite,while the absorption peak of yellow-green prehnit is stronger at 200 nm-450 nm.The color origin of prehnite is related to the valence state of ferrum element,and manganese element may have influence on it as well.