marcasite

/หˆmษ‘หkษ™sสŒษชt/

IPA: /M AA0 R K AH0 S AY0 T/

noun
  1. 1

    The orthorhombic form of iron disulfide, FeS2, occurring as yellow crystals.

  2. 2

    (jewellery) Pyrite.

  3. 3

    Any of various metal sulfides, usually iron sulfide minerals.

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