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| RARE
BI-COLOR TOURMALINE NATURAL COLOR
Hardness
7.5 |
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| Tourmaline chemical composition is (Na, Li,Ca) (Fe2, Mg, Mn, Al)3 Al6 I(OH)4 I (BO3)3ISi6O18I . |
| Crystaline system: Trigonal. |
| Occurences: In the acid magmatic rocks and associated pegmatites, limestones and schists, placers. |
| Coloured tourmalines are related to
sodolithic
pegmatites. | One distinguishes two principal types of tourmalines: the hexagonal type and the triangular one. |
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| Stone Price: SOLD |
33.76cts.
Bi-color tourmaline single |
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Stone Price: SOLD
ref: Tbie3376
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Depth:11.5 mm.
 
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BI-COLOR TOURMALINE |
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Scale determining the purity of a stone.
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| FL |
NFL |
SI1 |
SI2 |
MI1 |
 |
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 |
 |
 |
| Flaw
less |
Near
flaw less |
Slightly
included 1 |
Slightly
included 2 |
Medium
included 1 |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| MI2 |
MI3 |
VI1 |
VI2 |
HI |
 |
 |
 |
 |
 |
| Medium
included 2 |
Medium
included 3 |
Very
included 1 |
Very
included 2 |
Highly
included |
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