marcasite

From Medieval Latin marchasita et al., from Arabic مَرْقَشِيتَا (marqašītā).

• (UK) IPA^(key): /ˈmɑːkəsʌɪt/
• (US) IPA^(key): /ˈmɑɹ.kə.sɑɪ̯t/, /ˌmɑɹ.kəˈzit/
• Hyphenation: mar‧ca‧site

marcasite (countable and uncountable, plural marcasites)

1. (mineralogy) The orthorhombic form of iron disulfide, FeS₂, occurring as yellow crystals. [from 19th c.]

   Synonym: white iron pyrite

2. (jewelry) Pyrite.
3. (historical) Any of various metal sulfides, usually iron sulfide minerals. [from 15th c.]
   • 1999, Paracelsus, “Opus Paramirum”, in Nicholas Goodrick-Clarke, transl., Essential Readings, North Atlantic Books, page 95:

     If he wants to speak as a physician, however, he must say, this marcasite is the man's disease, hence it will cure him.

• Marcasite is physically and crystallographically distinct from pyrite, although the two have the same chemical composition.

• pyrite

• David Barthelmy (1997–2025) “Marcasite”, in Webmineral Mineralogy Database.
• “marcasite”, in Mindat.org‎^[1], Hudson Institute of Mineralogy, 2000–2025.

marcasite f (plural marcasites)

1. alternative form of marcassite

marcasite f (plural marcasiti)

1. (mineralogy) marcasite

• camerasti, camerista, ceramista, cresimata, macerasti, marciaste, masticare, ricamaste, smerciata