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Siderite

Siderite is a mineral composed of iron(II) carbonate. Its name comes from the Ancient Greek word σίδηρος, meaning "iron". A valuable iron ore, it consists of 48% iron and lacks sulfur and phosphorus. Wikipedia
Color: Pale yellow to tan, grey, brown, green, red, black and sometimes nearly colorless
Density: 3.96 g/cm3
Category: Carbonate mineral
Cleavage: Perfect on
Crystal class: Hexagonal scalenohedral (3m); H-M symbol: (3 2/m)
Crystal habit: Tabular crystals, often curved; botryoidal to massive
Crystal system: Trigonal