CERRUSITE 🔬 Chemical formula: PbCO₃ (Lead Carbonate) Crystal system: Orthorhombic Crystal habit: Often forms tabular, prismatic, or acicular crystals; can also appear in massive, granular, or twinned forms (notably cyclic twins). Colour: Colourless, white, grey, yellowish, or greenish; often transparent to translucent. Lustre: Adamantine to vitreous, sometimes silky. Hardness: 3 to 3.5 on the Mohs scale. Cleavage: Perfect on {110}, distinct on {021}. Fracture: Conchoidal to uneven. Density: Hig