黑云母的晶体形态与金云母相同。颜色为黑色、深褐色,有时带浅红、浅绿或其它色调。含钛高的呈浅红褐色,富含高价铁则呈绿色。透明至不透明。玻璃光泽,黑色则呈半金属光泽。硬度2-3,比重3.02-3.12。黑云母受热水溶液的作用可以蚀变为绿泥石、白云母和绢云母等其他矿物。黑云母因为含铁高,绝缘性能差,远不如白云母。黑云母细片常用作建筑材料填充物。 粒径较大的黑云母,极容易根据其片状形态,较深的颜色以及弹性,具有云母的完全解理,和受热以后,可略带磁性的特点等加以鉴别 在深成岩和浅成岩钟,特别是酸性或偏碱性的岩石中,大都含有黑云母。
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。
我厂生产的黑云母主要规格有:20目、40目、60目、80目、100目、200目等;
Biotite
Biotite is a silicate mineral within the mica group. Biotite can mainly be found in metamorphic rocks, sometimes in other rocks such as granite. Biotite appears black to brown, red or green, having a vitreous luster. It represents a flake texture or column texture.
Characteristics ofBiotite
Biotite appears black or dark brown, sometimes reddish or light green or in other color tones; for example, it is reddish brown with high Ti02 content, while it is green with rich high-valent iron. Biotitecan be transparent to translucent, has a vitreous luster, and its cleavage planehas a pearly luster, while black biotite has a semi-metallic luster.The flake has elasticity.Its rigidity is 2-3, while the specific gravity is3.02-3. 12. It represents yellow, brown or greenunder the transmission of microscope.
Chemical Composition Table of Biotite
Composition | SiO2 | Al2O3 | K2O | MgO | Na2O | S | P | 灼烧 |
Content % | 45.02 | 10.46 | 10.18 | 16.88 | 0.46 | 2.43 | 0.34 | 1.93 |
Biotite flake is often used as filler for building materials, also extensively used in decorative coatings such as stone paint;



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