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| LOOSE GREEN 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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7.76 cts.Cushion green tourmaline single |
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Pieces: |
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1 Tourmaline |
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Type: |
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100% Natural |
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Color: |
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Light Green |
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Shape: |
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Cushion |
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Weight: |
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7.76 Carats |
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Size: |
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12.1 x 11.2 mm |
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Clarity: |
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SI2 |
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Luster: |
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Excellent |
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Treatment: |
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None (N) |
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Origin: |
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Madagascar |
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| Tone scale: Light-medium. This stone has an |
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Refr. Index: |
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1.62-1.64 |
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Hardness |
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7.5 |
| obviously bluish-green color under daylight, |
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| the coloration is G under incandescent light. |
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Depth:8.7 mm. |
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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 |
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| MI2 |
MI3 |
VI1 |
VI2 |
HI |
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| Medium included 2 |
Medium included 3 |
Very included 1 |
Very included 2 |
Highly included |
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