|
INVESTIGATIONS
Stone |
RI min |
RI max |
Dens min |
Dens max |
Colour |
Location |
Info |
Spectrum |
UVS |
UVL |
Reference |
Magnetite - spinel
group |
|
|
4.64 |
5.11 |
|
Den Chai en Bo Phloi,
Thailand |
strong magnetic, Den Chai: 86% magnetite+10%
ulvöspinel; Bo Phloi: 48% magnetite +33%
ulvöspinel |
|
inert |
inert |
The Australian Gemmologist 2008 Vol 23, N°6,
p242-253 |
TABLES
Stone |
RI min |
RI max |
Dens min |
Dens max |
Reference |
Magnetite |
2.42 |
2.42 |
4.9 |
4.9 |
Gemmological Tables, Ulrich Henn, 2004
|
Magnetite |
|
|
5.17 |
5.17 |
Gems, R Webster, 5th edition 1994
|
Magnetite |
2.42 |
2.42 |
5.1 |
5.2 |
Tables of Gemstone Identification, Roger Dedeyn,
Ivo Quintens, 2007
|
CAUSE OF COLOUR
MINERAL INCLUSIONS
LOCALITIES
CHEMICAL DATA (%)
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Fe2O3 | |
Magnetite
|
black |
Den Chai |
Thailand |
The Australian Gemmologist 2009,Vol 23, N°6
p244 |
0.58 |
4.71 |
0.5 |
0.31 |
34.37 |
3.26 |
0.12 |
|
55.6 |
Magnetite
|
black |
Den Chai |
Thailand |
The Australian Gemmologist 2009,Vol 23, N°6
p244 |
0.61 |
4.53 |
0.35 |
0.47 |
32.95 |
3.27 |
|
0.38 |
57.39 |
Magnetite
|
black |
Bo Phloi |
Thailand |
The Australian Gemmologist 2009,Vol 23, N°6
p244 |
0.38 |
8.31 |
0.44 |
3.7 |
38.02 |
12.33 |
|
|
35.87 |
Magnetite
|
black |
Bo Phloi |
Thailand |
The Australian Gemmologist 2009,Vol 23, N°6
p244 |
0.42 |
6.58 |
0.44 |
2.78 |
37.72 |
12.96 |
|
0.49 |
37.8 |