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💙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.
💙Color: Blue
💙Luster: Greasy, Vitreous
💙Crystal system: Cubic crystal system
💙Chemical formula: (Na,Ca)₈Al₆Si₆O₂₄ (S,SO)₄
💙Hardness (Mohs hardness scale): 5 – 5.5
💙Transparency