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pyrite
pyrite
pyrite (fool's gold) Sulphide mineral, FeS
2; sp. gr. 4.9–5.2;
hardness 6.0–6.5;
cubic; pale brass-yellow, does not tarnish; greenish-black
streak;
metallic lustre; crystals
cubic,
pyritohedra (pentagonal dodecahedra),
octahedra, or combinations of the two;
cleavage poor basal {001}; occurs with other
sulphide ores genetically associated with
basic and
ultrabasic rocks, and together with
pyrrhotine and
chalcopyrite; very widely distributed in a great variety of environments, and found in
igneous rocks as an
accessory mineral, in
sedimentary rocks (especially black
shales), as nodules in
metamorphic rocks, and common in hydrothermal veins, in replacement deposits, and contact
metamorphic rocks; alters to iron sulphate and
limonite. It was formerly used widely for the production of sulphuric acid. Compare
MARCASITE.
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Buying pyrite at Huanzala
Magazine article from: Mineralogical Record; 7/1/1997; ; 639 words
; ...have good Chispas today," "I have cocos (pyritohedral pyrite) today," "I have cuadros (cubic pyrite) today," or "I have triangulos (meaning "triangles"-octahedral pyrite) today." It would sound almost like the stock market...
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Flotation behaviors of pyrites with different chemical compositions
Magazine article from: Minerals & Metallurgical Processing; 5/1/2004; ; 700+ words
; ...showed that these pyrite samples have different...characteristics of pyrites using ethyl xanthate...flotation behaviors of pyrites. "Which species are responsible for pyrite flotation?" is...observed differences in pyrite flotation behaviors...flotation behaviors of pyrites. The ...
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Investigation on the leaching of pyrite in a germ-free system
Magazine article from: Minerals & Metallurgical Processing; 5/1/2007; ; 700+ words
; ...data during the leaching of pyrite in a germ-free-system...and passivation mechanism of pyrite during the bioleaching process...and methods Materials. The pyrites used in the experiments were...Changsha Mineral Market. The pyrite crystals were intact and had...
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Role of dixanthogen on pyrite flotation: Solubility, adsorption studies and Eh, FTIR measurements
Magazine article from: Minerals & Metallurgical Processing; 5/1/2002; ; 700+ words
; ...Abstract The xanthate adsorption mechanism on pyrite was investigated with an emphasis on solubility...spectrophotometer measurements were performed. Pyrite floats at pH levels between 3 and 6 using...a maximum at pH 4. The solubility of pyrite in the absence and presence of xanthate...
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The effect of adsorbed lipid on pyrite oxidation under biotic conditions.
Magazine article from: Geochemical Transactions; 12/1/2006; ; 700+ words
; ...responsible for catalyzing the oxidation of pyrite and concomitant development of acidic...growth of this bacterial species on the pyrite surface and in the aqueous phase at a...the role of adsorbed lipid in preventing pyrite dissolution. Both acid washed pyrite...
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A method for generating uniform size-segregated pyrite particle fractions.(Methodology)(Report)
Magazine article from: Geochemical Transactions; 10/10/2007; ; 700+ words
; ...1]; David A Dzombak [2] Background Pyrite, FeS 2 , is one of the most abundant...Regardless of its source, the weathering of pyrite via oxidative dissolution can result in...despite numerous experimental studies of pyrite oxidation [14, 15, 16, 17, 18, 19...
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Effect of aging conditions on the leaching of mechanically activated pyrite and sphalerite
Magazine article from: Metallurgical and Materials Transactions; 10/1/2003; ; 700+ words
; ...mechanically activated pyrite and sphalerite decreases...mechanically activated pyrites aged in nitrogen...taking place in milled pyrites after aging in air...indicated that the milled pyrite exposed Io air is...mechanically activated pyrite and sphalerite on...mechanically activated ...
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Greigite: a true intermediate on the polysulfide pathway to pyrite.(Research article)
Magazine article from: Geochemical Transactions; 3/21/2007; ; 700+ words
; ...Benning [1] Background The formation of pyrite is an important geochemical pathway linking...Furthermore, chemical reactions involved in pyrite formation have important implications...the past half century, the formation of pyrite has been studied extensively at low temperatures...
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Fossil plants from the eocene London Clay: The use of pyrite textures to determine the mechanism of pyritization
Magazine article from: Journal of the Geological Society; 9/1/2002; ; 700+ words
; ...understanding of the process of pyritization by investigating pyrite textures in relation to cell type and quality of...optical microscope and SEM, the latter equipped to map pyrite and carbon. Pyrite textures include microcrystalline, framboidal...
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The kinetics and mechanism of the pyrite-to-pyrrhotite transformation
Magazine article from: Metallurgical and Materials Transactions; 4/1/1998; ; 700+ words
; The kinetics of the transformation of pyrite to pyrrhotite have been investigated...the H^sub 2^ reduction occurs with pyrite samples from different sources depends...INTRODUCTION THE thermal decomposition of pyrite (FeS^sub 2^) has been investigated...
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pyrite
Book article from: The Columbia Encyclopedia, Sixth Edition
pyrite or iron pyrites , pale brass-yellow mineral...sulfuric acid. The term pyrites is applied to any of a...Some minerals resembling pyrite in appearance or composition...chalcopyrite (copper pyrites), cobaltite , marcasite...
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iron pyrites
Book article from: The Columbia Encyclopedia, Sixth Edition
iron pyrites see pyrite .
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pyrites
Book article from: The Concise Oxford Dictionary of English Etymology
pyrites † fire-stone; sulphide of iron. XVI. — L. pyrītēs — Gr. purī́tēs sb. use of adj. pert. to fire, f. pûr , pur- FIRE ; see -ITE .
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copper pyrites
Book article from: A Dictionary of Earth Sciences
copper pyrites See CHALCOPYRITE .
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magnetic pyrite
Book article from: The Columbia Encyclopedia, Sixth Edition
magnetic pyrite see pyrrhotite .
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