- Also called white iron pyrites. a common mineral, iron disulfide, FeS2, chemically similar to pyrite but crystallizing in the orthorhombic system.
- any of the crystallized forms of iron pyrites, much used in the 18th century for ornaments.
- a specimen or ornament of this substance.
Origin of marcasite
Examples from the Web for marcasite
Instead, Lagerfeld explored the darkness of malachite, iron ore, and marcasite.Paris Fall Fashion Week 2012: A Finale at Yves Saint Laurent
March 7, 2012
These bracelets and necklaces are fastened by a brooch or pin of brilliants or marcasite.
His stones all those of divers colours, white and red carnelian and marcasite, or fire-stone.The Influence of the Stars
Marcasite and pyrrhotite, other iron sulphide minerals, are frequently found with pyrite and are used for the same purposes.The Economic Aspect of Geology
C. K. Leith
The forehead was painted blue and over the paint was dusted powder of marcasite.The Works of Hubert Howe Bancroft, Volume 3
Hubert Howe Bancroft
Even when only a small proportion of mundic, pyrite or marcasite is present, it is highly objectionable for several reasons.The Natural History of Clay
Alfred B. Searle
- a metallic pale yellow mineral consisting of iron sulphide in orthorhombic crystalline form used in jewellery. Formula: FeS 2
- a cut and polished form of steel or any white metal used for making jewellery
Word Origin and History for marcasite
crystalized pyrite, early 15c., from Medieval Latin marchasita, of obscure origin, perhaps via Spanish, probably from Arabic, though OED doubts this. Perhaps ultimately from Persian marquashisha [Klein]. "This name has been used for a number of substances but mainly for iron pyrites and especially for the crystalline forms used in the 18th century for ornaments." [Flood]
- A light yellow to gray, metallic, orthorhombic mineral. Marcasite is a polymorph of pyrite and looks similar to it but has a lower specific gravity, is paler in color, and often has a radiating fibrous structure. Chemical formula: FeS2.