- an orthorhombic mineral, FeS, that is dimorphic with pyrite; iron sulfide
- this mineral cut and mounted on silver or other white metal to look like brilliants
Origin: Fr marcassite from Midieval Latin marcasita from Arabic marqashītā from Persian marqashīshā
Used by arrangement with John Wiley & Sons, Inc.
- A mineral with the same composition as pyrite, FeS2, but differing in crystal structure. Also called white iron pyrites.
- An ornament of pyrite, polished steel, or white metal.
Origin: Middle English, from Medieval Latin marcasīta, from Arabic marqašīīā, from Aramaic marqəšitā, from Akkadian marḫašu, from marḫaši, ancient region in the eastern Iranian plateau.
- marˌca·sitˈi·cal adjective
marcasite - Science Definition
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