SideriteFeCO3
Class: Carbonate Hardness: 3.5 - 4 Density: 4.0 Streak: White Lustre: Vitreous Habit: Aggregate of crystals or grains Colours: Tan brown (typical) | | Crystal System: Hexagonal Cleavage: Perfect rhombohedral Fracture: Uneven Magnetism: None Reaction with HCl: Weak | Identification in hand sample: Identified by colour and hardness. Associations: Produced by hydrothermal alteration of limestone. May also occur as concretionary or oolitic forms in clay ironstones. Industrial / ecomonic uses: Sometimes used as an iron ore. Also used in pigments where a red or brown colour is desirable. |