Instead, Lagerfeld explored the darkness of malachite, iron ore, and marcasite.
marcasite is thus the less stable of the two modifications of iron disulphide.
His stones all those of divers colours, white and red carnelian and marcasite, or fire-stone.
marcasite and pyrrhotite, other iron sulphide minerals, are frequently found with pyrite and are used for the same purposes.
marcasite occurs under the same conditions as pyrites, but is much less common.
The forehead was painted blue and over the paint was dusted powder of marcasite.
Nodules of pyrites and of marcasite are common in many clays, sandstones and marls.
Even when only a small proportion of mundic, pyrite or marcasite is present, it is highly objectionable for several reasons.
These bracelets and necklaces are fastened by a brooch or pin of brilliants or marcasite.
It is a noteworthy fact that whilst pyrites has been prepared artificially, marcasite has not.
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]