siderite

/S IH1 D ER0 AY0 T/
noun
  1. 1

    A widespread brown mineral, FeCO3, having the structure of calcite

  2. 2

    An iron meteorite

  3. 3

    An indigo-blue variety of quartz.

  4. 4

    Magnetic iron ore; lodestone

Source: https://en.wiktionary.org/wiki/siderite