They are, respectively, a type of meteorite of ferrous composition and a type of stone composition.
Like rock, a siderite is a dark brown or brown, transparent or translucent mineral, with fatty luster, composed of iron carbonate.
It crystallizes in the rhombohedral system and can be found in large formations mixed with clay. Its hardness varies between 3.5 and 4, and its relative density between 3.83 and 3.88. When heated it acquires a strong magnetism.
Siderite has long been extracted as an important iron ore in England, Scotland, Germany and Austria.
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