Sulfide mineral Thiospinel group Spinel structural group
Formula (repeating unit)
Fe2+Fe3+2S4
IMA symbol
Grg[1]
Strunz classification
2.DA.05
Crystal system
Cubic
Crystal class
Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m)
Space group
Fd3m
Unit cell
a = 9.876 Å; Z = 8
Identification
Color
Pale pink, tarnishes to metallic blue-black
Crystal habit
Spheres of intergrown octahedra and as disseminated microscopic grains
Mohs scale hardness
4 to 4.5
Luster
Metallic to earthy
Diaphaneity
Opaque
Specific gravity
4.049
Other characteristics
Strongly magnetic
References
[2][3][4]
Greigite is an iron sulfide mineral with the chemical formula Fe2+Fe3+2S4. It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). It was first described in 1964 for an occurrence in San Bernardino County, California, and named after the mineralogist and physical chemist Joseph W. Greig (1895–1977).[4][5]
^Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1990). "Greigite" (PDF). Handbook of Mineralogy. Vol. I (Elements, Sulfides, Sulfosalts). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209708. Retrieved December 5, 2011.
^Greigite. Mindat.org
^ abGreigite. Webmineral
^Skinner, Brian J.; Erd, Richard C.; Grimaldi, Frank S. (1964). "Greigite, the thio-spinel of iron; a new mineral" (PDF). American Mineralogist. 49: 543–55.
Greigite is an iron sulfide mineral with the chemical formula Fe2+Fe3+2S4. It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). It was first...
iron and sulfur. By increasing order of stability: Iron(II) sulfide, FeS Greigite, Fe3S4 (cubic) Pyrrhotite, Fe1−xS (where x = 0 to 0.2) (monoclinic or hexagonal)...
and in association with chalcopyrite, cubanite, pentlandite, pyrrhotite, greigite, maucherite, and troilite. Mackinawite also occurs in reducing environments...
mollusc species, the scaly-foot gastropod, even uses the iron sulfides greigite and pyrite.[citation needed] Some organisms, such as some foraminifera...
smell is mainly due to its sulfur content. Because of the presence of greigite (Fe3S4, Iron(II,III) sulfide) in the mineral, it forms brownish-pink to...
to exhibit framboidal structures include magnetite, hematite, and greigite. Greigite is considered an essential precursor of framboidal pyrite formation...
magnetite (Fe3O4), or iron sulfide magnetosomes, which contain crystals of greigite (Fe3S4). Several other iron sulfide minerals have also been identified...
about the environments in which greigite magnetofossils are created and the magnetic properties of the preserved greigite particles. Existence of magnetotactic...
magnetotactic bacteria are reported to precipitate either magnetite or greigite. These crystals, and sometimes the chains of crystals, can be preserved...
extremophile bacteria from sulfurous environments have been isolated with greigite (an iron-sulfide compound Fe3S4). Some magnetotactic bacteria also contain...
layer of magnetite Buena Vista Iron Ore District Corrosion product Ferrite Greigite Magnesia (in natural mixtures with magnetite) Mill scale Magnes the shepherd...
iron-sulphur minerals pyrite and greigite. Magnetotactic bacteria also employ magnetic iron minerals magnetite and greigite to produce magnetosomes to aid...
Kairei hydrothermal vent field. The latter uses iron sulfides (pyrite and greigite) for the structure of its dermal sclerites (hardened body parts), instead...
concentrations. Magnetosomes are composed of the mineral magnetite or greigite and are surrounded by a lipid bilayer membrane. The morphology of magnetosomes...
class of strongly magnetic minerals is the iron sulfides, particularly greigite and pyrrhotite. Extraterrestrial environments being low in oxygen, minerals...
concentrations of detectable monosulfides (≥ 0.01% acid volatile sulfide) (e.g., greigite and mackinawite). Note that monosulfidic material has not replaced Monosulfidic...
1995). "Controlled Biomineralization of Magnetite (Fe(inf3)O(inf4)) and Greigite (Fe(inf3)S(inf4)) in a Magnetotactic Bacterium". Applied and Environmental...
its foot, and these are mineralized with the iron sulfides pyrite and greigite, which had never previously been found in any metazoan but whose ingredients...
surface reactivity of such iron and manganese nanoparticles and pyrite−greigite nanocomposite when exposed to highly toxic contaminants present in water...
form. Other theories require less common minerals such as mackinawite or greigite. A catalog of the minerals that were formed during the Hadean Eon includes...
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