Lapis Lazuli
Lapis Lazuli
Lapis lazuli, or lapis for short, is a deep blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
Properties
- Chemical formula: (Na,Ca)8(AlSiO4)6(S,SO4,Cl)2
- Crystal system: Cubic
- Hardness: 5-5.5
- Color: Blue
- Luster: Vitreous
- Streak: Light blue
- Cleavage: Absent
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