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Mining composition
Olivine is an ultrabasic
mineral, mainly of a solid solution consisting of Fosterite (magnesium silicate
- Mg2 SiO4) and Fayalite (iron silicate - Fe2
SiO4).
|
Mineral
composition |
| Olivine (Mg-Fe)2 SiO4 |
95 - 97 % |
Piroxen, spinel, chromite |
3 - 5 % |
|
Chemical
composition |
| SiO2 |
41 - 45
% |
MgO |
41 - 44
% |
| FeO |
6 - 7 % |
Fe2O2 |
0,2 - 2
% |
| CaO |
1,5 - 4
% |
All2O3 |
1 - 3 % |
| Other |
0 - 3 % |
Free silica and asbestos |
none |
| Carbonates |
none |
Soluble salt |
none |
|
Physical chemical
characteristics |
| Specific gravity |
3,2 - 3,3 (t/m3) |
Sand bulk |
1,5 - 1,7 (t/m3) |
| Shape of grains |
polyhedric |
Ph |
ultrabasic |
| Los Angeles |
8 - 12 |
Compression strengh |
2300 - 2600 Kg/cm2 |
| Hardness (Vickers's) |
1000 |
Hardness (Mohs's) |
6,5 - 7 |
| Crushing coefficient |
166 - secondo norme
CNR |
Linear thermal expansion ( 800° C ) |
0,8 - 1,1 % |
Thermal conducitivity
(25 - 1300° C) |
0,2 - 0,33
|
Abrasion coefficient |
1,29
(al tribometro) |
| Loss of ignition |
0,2 - 1,5 % |
Sintering temperature |
1380 - 1400° C |
| Opacity U.V ray |
100% |
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