Lapis Lazuli is a deep blue opaque gemstone, used in antiquity and continuously used throughout the generations. It still continues to be popular today, and remains one of the most important opaque gemstones. Lapis Lazuli is chiefly composed of the mineral Lazurite, with additional other minerals including white Calcite and sparkling specks of Pyrite.
| Chemical Formula | The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula:(Na,Ca)8Al6Si6O24(S,SO)4 |
| Color | Blue, Multicolored |
| Hardness | 5Â -Â 5.5 |
| Crystal System | Isometric |
| Refractive Index | 1.5 |
| SG | 2.4Â -Â 2.5 |
| Transparency | Opaque |
| Double Refraction | None |
| Luster | Vitreous to greasy |
| Cleavage | 3,6 |
| Mineral Class | Rock that is mostly Lazurite with minor Calcite, Pyrite, and other minerals |
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