Difference between revisions of "Lapis Lazuli"
From The Gemology Project
Nick Lombard (talk | contribs) (Added Enhancements) |
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* Fracture filling - wax (with dye or withou) - conceal cracks and fractures and to improve luster | * Fracture filling - wax (with dye or withou) - conceal cracks and fractures and to improve luster | ||
* Dye - color staining - to produce evenly colored material | * Dye - color staining - to produce evenly colored material | ||
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| + | ==Images== | ||
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| + | [[Image:Lapis Afghanistan.jpg|left|200px|thumb|Untreated lapis lazuli cabochon from Afghanistan.<br />Image courtesy of Scott Davies.]] | ||
| + | <br clear="all" /> | ||
Latest revision as of 01:26, 21 May 2008
| Lapis Lazuli | |
|---|---|
| Chemical composition | rock consisting of lazurite, hauyne, calcite and pyrite |
| Habit | aggregate |
| Fracture | uneven |
| Hardness | 5.5 |
| Refractive index | 1.500 - 1.670 |
| Specific gravity | 2.50 - 3.00 |
| Lustre | resinous to vitreous |
Lapis Lazuli with Pyrite inclusions
Enhancements
Common enhancements to lapis lazuli:
- Fracture filling - wax (with dye or withou) - conceal cracks and fractures and to improve luster
- Dye - color staining - to produce evenly colored material
Images
