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lapis lazuli gem b t - Newest pictures
gemstones.peperonity.net

☹The Gemstone Lapis Lazuli☹

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 Calciteand sparkling specks of Pyrite.
Chemical FormulaThe chief constituent Lapis Lazuli is Lazurite, with the following chemical formula:
(Na,Ca)8Al6Si6o24(S,SO)4
ColorBlue, Multicolored
Hardness5 - 5.5
Crystal System Isometric
Refractive Index1.5
SG2.4 - 2.5
Transparency Opaque
Double RefractionNone
Luster Vitreousto greasy
Cleavage3,6
Mineral Class Rockthat is mostly Lazuritewith minor Calcite, Pyrite, and other minerals


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