Lapis Lazuli
| Refractive Index : 1.500 or 1.670 |
| Optical Characteristic : SR, AGG |
| Specific Gravity : 2.75 (+0.25 – 0.25) |
| Formula : Varies depending on mineral content. |
| Crystal System : Rock |
| Variety/Species : Lapis Lazuli |
| Species/Group : Sodalite Group |
| Birefringence : None |
| Dispersion : N/A |
| Hardness : 5 to 6 |
| Toughness : Fair |
| Ultrasonic : Risky |
| Steam : Never |
| UV Long : Inert to moderate |
| UV Short : Inert to moderate |
| Pleochroism : None |
| Strength : N/A |
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| Pleochroism Colors : None |
| Heat : Avoid heating |
| Acids : Attacked by acids and /or chemicals |
| Light : Stable |
| Polish Luster : Waxy to vitreous |
| Fracture : Granular to uneven |
| Fracture Luster : Dull |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Sulfur-connected color centers |
| Enhancements : Dyeing, impregnation |
| Cleavage : None |
| Color Range : Medium to dark, |
| Transparency : |
| Phenomena : |
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| Separations : Lapis Lazuli from- |
| Identifying Characteristics and information |
| Spectral Data |
| Trade Names and Misnomers Afghan Lapis Chilean Lapis Gold Sapphire(M) Lapis Lazuli Lasurite Lazurite Persian Lapis Russian Lapis Sapphiros of Pliny Siberian Lapis |
Tags: afgham lapis, chinese lapis, lapis lazuli, lasurite, lazurite, russian lapis, siberian lapis
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