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黑云母的鉴定特征

Release date:2018-12-21  source:中南选矿网  Browse times:48
核心提示:黑云母的鉴定特征:黑云母:呈黑色、深褐色,有时带浅红、浅绿或其它色调;含TiO2高的呈浅红褐色,而富含高价的为绿色。透明至

黑云母.jpg 

黑云母的鉴定特征:黑云母:呈黑色、深褐色,有时带浅红、浅绿或其它色调;含TiO2高的呈浅红褐色,而富含高价铁的为绿色。透明至半透明。玻璃光泽,解理面显珍珠光泽,黑色者呈半属光泽。薄片具弹性。硬度 2─3。比重3.02─3.12。 显微镜透射光下呈黄、褐色或绿色。   近年来,黑云母也被广泛应用在真石漆等装饰涂料中。黑云母化学组成: K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2,类质同象代替广泛,所以不同岩石中产出的黑云母,其化学组成成分差距很大。一般酸性和碱性岩浆岩中的黑云母,FeO高, MgO低;基性和超基性岩中的黑云母,MgO高,FeO低;在碱性伟晶岩中的黑云母,MgO低,而Fe2O3相对要高一些。

 
 
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