English: Lazuriet; Na8ca8al12si12o24s.
Use: semi-precious stone, prized since antiquity for its intense color.
Habitat: in crystalline marble as a result of contact metamorphism.
MineralogyLapis lazuli is a deep-blue metamorphic rock.
Component: •
Lazurite, most important 25% to 40%, a blue feldspathoid silicate mineral with the formula (Na,Ca)8(AlSiO4)6(S,SO4,Cl)
•
Calcite (white)
•
Sodalite (blue),
•
Pyrite (metallic yellow).
• ±: augite, diopside, enstatite, mica, hauynite, hornblende, nosean, löllingite, geyerite.