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LAPIS LAZULI 'A'

LAPIS LAZULI 'A'
Lapis lazuli is actually a rock that contains a number of minerals like lazurite, hauynite, sodalite, noselite. It also has varying amounts of pyrite and white calcite mineral in a vein-like pattern. The specific gravity ranges between 2.7 and 2.9. The average refractive index of this gemstone is 1.50 and the hardness on Mohs scale is 5.5. If a drop of hydrochloric acid is dropped on the gem, there is a reaction that results in a rotten egg smell.
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