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认识仿“翡”品种——黄色钙铝榴石

2014年4月10日   [来 源]

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认识仿品种——黄色钙铝榴石

近来,在广东的玉器市场,出现了一种非常好的黄色翡翠,并且价格比一般的差的翡翠贵好几倍。经过常规仪器和大型仪器的鉴定,确定这种高品质的翡翠实际上是钙铝榴石集合体。

常规检测

   首先,用肉眼观察这种钙铝榴石,颜色均匀,呈黄色、褐黄色、黄褐色、褐红色,光泽强,半透明至微透明,手掂有重感。

 

  

      图1 钙铝榴石原料颜色        2 钙铝榴石饰品强的光泽

用常规仪器检测,测得其折射率为1.72~1.74,静水称重测得密度为3.4~3.6g/cm3,在紫外荧光灯下呈惰性,在显微镜下,可见其结构细腻,含有较多黑色矿物包裹体。

   

3强光透射下拍摄的钙铝榴石          4放大至40倍镜下拍摄钙铝榴石的结构

大型仪器

    因为这种钙铝榴石集合体通常和符山石共生,其数据又与符山石非常相近,为了确定宝石种属,先后用红外光谱仪和X射线衍射仪,将样品粉碎了鉴定,确定为钙铝榴石。红外光谱图和衍射图见下图:

      

钙铝榴石的红外图谱

 

钙铝榴石的衍射图

    这种钙铝榴石的蒙蔽性很强,肉眼很难与黄翡区别开来(见图7)。但仔细观察,还是可以分辨的,钙铝榴石比翡翠有较均匀的颜色,更强的光泽,手感更重,结构更细腻。

 

           图左边为翡翠  右边为钙铝榴石

希望商家和消费者在玉器市场选购时加倍小心,以免上当受骗。

 

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