黑云母一般是镁铁质及超镁铁质岩石中的次要成分。
Biotite is a subordinate constituent of the mafic and ultramafic rocks generally.
我们的超细矿物质粉底，是为更好的遮盖和中性到油性皮肤设计的，包括：氧化锌，云母，二氧化钛，高岭土，硬脂酸镁，铁的氧化物，二氧化硅。
Our Superpower mineral foundation is designed for more coverage and for use on normal to oily skin. Contains: Zinc oxide, Mica, Titanium Dioxide, Kaolin, Magnesium Stearate, Iron Oxides, Silica.
配方中K_2O含量，不仅影响着云母长大，而且还对熔体是否会析出硅镁石起着关键作用。
It is emphasized that the amount of K_2O inthe batch composition not only has an effect on the growth of mica crystals but also isa determining factor to the segregation of humite in the melt.
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