from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various natural metallic sulfide minerals, especially of iron.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of pyrite.
from the GNU version of the Collaborative International Dictionary of English
- n. A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color.
from The Century Dictionary and Cyclopedia
- n. Either of the common sulphids of iron, pyrite and marcasite, but also the yellow sulphid of copper and iron, chalcopyrite: the former are called distinctively iron pyrites, while the latter is known as copper pyrites.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any of various metallic-looking sulfides (of which pyrite is the commonest)
_Copperas: _ (Sulphate of iron or green vitriol,) a bright green mineral substance, formed by the decomposition of a peculiar ore of iron called pyrites, which is a sulphuret of iron.
_Copperas_, (sulphate of iron, or green vitriol,) a bright green mineral substance, formed by the decomposition of a peculiar ore of iron, called pyrites, which is a sulphuret of iron.
This is especially important if fuel or clay contain sulphur compounds such as pyrites which are transformed into sulphuric acid in the kiln gases.
The changes which take place in stored coal are of two kinds: 1st, the oxidization of the inorganic matter such as pyrites; and 2nd, the direct oxidization of the organic matter of the actual coal.
Mr. TALJAARD wished to know if the words 'pyrites' and 'concentrates' could not be translated into the Dutch language.
'Mr. Taljaard wished to know if the words "pyrites" and "concentrates" could not be translated into the Dutch language.
Substances which lose sulphur on heating (such as pyrites) are thus treated: -- Weigh up 1 gram, and evaporate nearly to dryness with 10 c.c. each of nitric and hydrochloric acids.
This material is derived, by the process of weathering, from the iron pyrites which is disseminated, in great abundance, and in a state of extreme comminution, through the slates, many of which, being feldsphatic, yield also alum.
A Guide to Capitalists and Emigrants: Being a Statistical and Descriptive Account of the Several Counties of the State of North Carolina, United States of America; Together with Letters of Prominent Citizens of the State in Relation to the Soil, Climate, Productions, Minerals, &C., and an Account of the Swamp Lands of the State
This substance is no doubt in certain cases an astringent salt, formed in those marls which contain iron pyrites which is prone to decompose on exposure to those bodies which contain oxygen, the sulphur thereby is oxidated, and slowly acts upon the iron and forms copperas, or upon alumina, which is present in the marl.
This material is derived by the process of weathering, from the iron pyrites, which is disseminated in great abundance, and in a state of extreme comminution through the slates, many of which, being feldspathic, also yield alum. "