Hardness
|
7.5 - 8.0 Mohs
|
Bulk density
|
2.34 g/cm3
|
Specific gravity
|
4.10 g/cm3
|
PH
|
7
|
Conductivity
|
<25m.S/m
|
Free Metals
|
<0.01%
|
Chloride
|
<25 ppm
|
Grain shape
|
Sharp angular
|
Melting point
|
1250ºC +/-
|
Color
|
red
|
Alumina (AI2O3)
|
18.10-21.60%
|
Silicon (SIO2)
|
36.00-37.50% (no free silica)
|
Iron(Fe2O3)
|
27.50-29.80%
|
Magnesium (MgO)
|
4.75-5.40%
|
Calcium (CaO)
|
6.41-9.50%
|
Titanium (TIO2)
|
1.50-2.50%
|
Manganese (MnO)
|
0.50%
|
Phosphorous (P2O)
|
0.05%
|