Siderite
| Formula | Fe2+CO3 |
| Origin | Bollnbach Pit (Germany) |
| Description | |
| Classification (Lapis) | Carbonates |
| Crystal System | trigonal |
| Hardness | 3,75 – 4,25 |
| Colour | yellowish brown, brown; white, ash-gray, yellowish gray, pale green; colorless, yellow, yellow-brown in transmitted light |
| Streak | white |
| Luminescence | pink |
| Luster | vitreous |
| Transparency (Opacity) | translucent |
| Cleavage | perfect |
| Fracture | uneven to conchoidal |
| Magnetism | negative |
| Geological Setting | a common component of bedded sedimentary iron ores and metamorphic iron formations; in hydrothermal metallic veins |
| Specific Gravity | 3,96 g/cm3 |
