The natural muscovite is used muscovite as the mateial, through selecte and crush, so this to be the white powder, the muscovite has the same appliance  as the glass, and the powder usefullness have the inflution of the thickness of the muscovite, it is used in the plastic and some others, it is one of the most important chemical material.
This product have the high insolution, it can afford the high temperature and can pre the solid, so it have the high textile.

The chemical name is KAl2(AlSi3O10)(OH)2
The every material in the powder is:
Specification

White number
%
≥70

Content
G/cm3
0.20

Density
G/cm3
2.80

Sandiness content
%
≤0.15

Have water percent
%
≤0.15

L. O. I
%
5.0

PHnumber
6.5-7.5

The highest temperature can afford
≤550

Magnetism substance content
Ppm
≤30