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

Biotite flake is often used as filler for building materials, also extensively used in decorative coatings such as stone paint;

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