The
biotite present black, deep brown, aqua or other hue. It takes
on pink brown that contain the high TiO2, and green that contain
the abandance of the iron, transparent to translucent.
| Chemical
Composition % |
| SiO2 |
Al2O3 |
K2O |
MgO |
Na2O |
S |
P |
bum
|
| 45.02 |
10.46 |
10.18 |
16.88 |
0.46 |
0.46 |
0.34 |
1.93 |
B:The biotite takes on luster of glass and interior takes
on luster of the pearl.The biotite show luster of semi-metal,flake
has elasticity.Through microscope see what is showed snuff
color or green.Rigidity:2-3;Specific gravity:3.02-3.12.
The slice of biotite is usually
used to make padding material of architecture
|
