Lazurite
Alumino-silicate mineral whose blue colour is due to a sulfide species and not copper
Lazurite
Lazurite, old name Azure spar, is a tectosilicate mineral of sulfate, sulfur, and chloride with the formula (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)]. It is a feldspathoid and a member of the sodalite group. Lazurite crystallizes in the isometric system although well‐formed crystals are rare. It is usually massive and forms the bulk of the gemstone lapis lazuli.
Read on Wikipedia · Image Didier Descouens, CC BY-SA 4.0
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