55

Polished Lazurite from Madagascar

Weight 960 gr
CHARACTERISTICS
Weight 960 gr
Size 125x75x70 mm
Reference 211106640
Mineral mineral Lazurite
Category Decoration stones
Group Free forms
Country Country Madagascar Madagascar
Contractual photos showing the object you will receive when ordering. the photos were taken in order to obtain the most faithful possible rendering of the object.
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Formula (Na,Ca)8[Al6Si6O24](SO4,S,Cl)2] LAZURITE
O Oxygen Other no metal 38.53%
Si Silicon Metalloids 16.91%
Al Aluminum Poor metal 16.23%
Na Sodium Alkali metal 13.84%
Ca Calcium Alkaline earth metal 8.03%
Cl Chlorine Non-metal halogen
S Sulfur Other no metal
93.56%
Lazurite is a mineral from the silicate family, more precisely a sodium and sulfur aluminosilicate with sulfate groups. It generally occurs as blue granules in limestone, and is the main constituent of the semi-precious stone lapis lazuli. It crystallizes in the isometric system, but well-formed crystals are rare. Most often, it appears in the form of granular masses with a glassy sheen. Its hardness on the Mohs scale varies between 5 and 5.5, which makes it quite resistant. Its density is approximately 2.4 to 2.5 g/cm³. The intense blue of lazurite is due to the presence of S3- ions in the crystal structure. This mineral is mainly used as a pigment for paint and ceramics.

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