河南嵩县车村至合裕一带萤石宝石学特征及产地化学特性

The Analysis of the Gemological and Chemical Characteristics of Fluorite in the Region from Checun to Heyu,Songxian County,Henan Province

萤石(Fluorite),又称“氟石”,在矿物学中属萤石族,主要化学成分为CaF2。嵩县车村-栾川县合裕一带萤石矿具有产量较大、分布较为集中、矿床类型多等特点。对实地所采集的萤石样本进行常规宝石学测试、显微观察、紫外荧光、电感耦合等离子体发射光谱,EDTA滴定分析等试验方法进行分析测试,结果表明:栾川萤石样本结晶形态为块状、粒状集合体;可见参差状、亚贝壳状断口;颜色可见紫色、绿色、黄色呈团状、条带状渐变分布;亚玻璃光泽—弱玻璃光泽;半透明—微透明;均质体;折射率为1.434~1.1.436(单折射);无多色性;莫氏硬度4;显微观察可见裂隙,黑褐色、黄褐色等矿物固体、固液两项包裹体,偶见彩色薄膜干涉效应,可见颜色生长带,白色伴生矿物;紫外光照射下LW—呈蓝白色中等荧光,SW—呈黄白色弱荧光;主要化学成分占比为Ca(50.04%),F(47.52%),略低于萤石主要化学元素的理论值,此外含有Si、K、Al、Mg、Fe、Ti等微量元素。

Fluorite,also known as calcium fluoride,belongs to fluorite clan in mineralogy,whose main chemical components is CaF2.The fluorite mine in the Region from Checun to Heyu is characterized by larger output,concentrated distribution and various deposit types.Fluorite samples collected from the mine are analyzed in terms of conventional gemological testing,microscopic observation,ultraviolet fluorescence testing,inductively coupled plasma emission spectrum,EDTA titration analysis.The results show that fluorite samples in luanchuan appears to be block granular aggregate;the irregular sub conical fracture was found;their color appear to be purple,green and yellow in gradual clumps and stripes as well as Sub vitreous luster weak vitreous luster;semitransparent and slightly transparent;homogenate;The refractive index is 1.434~1.1.436(single refraction).It’s none polychromatic and Mohs hardness is 4.The microscopic observation showed that there are cracks,solid and liquid inclusions of dark brown and yellowish brown minerals,occasional interference effect of color film,visible color growth zone,white associated minerals.In ultraviolet light,LW appears to be blue and white with medium fluorescence,while SW appears to be yellow and white with weak fluorescence.The main chemical components are Ca(50.04%)and F(47.52%),which are slightly lower than the theoretical standard of the main chemical elements of fluorite.Besides,it containes trace elements such as Si,K,Al,Mg,Fe and Ti.