Siderite

Origin

Latin sideritis ("lodestone"), from Ancient Greek , of iron, from iron.

Full definition of siderite

Noun

1. (uncountable, mineral) a widespread brown mineral, FeCO₃, having the structure of calcite
2. (countable) an iron meteorite
3. An indigo-blue variety of quartz.
4. (obsolete) magnetic iron ore; lodestone