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Maghemite from
Venus


Locality type:Planet
Classification
Species:Maghemite
Formula:(Fe3+0.670.33)Fe23+O4
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Maghemite data
Locality Data:Click here to view Venus
Data Identifiers
Mindat Occurrence Record ID:1269027
Long-form Identifier:1:3:1269027:7
GUID (UUID V4):5a24cbcb-25b9-49cf-b45a-6fd739698d0e
References
Reference Search (possible matching items)
Journal (article/letter/editorial)
dioxide-rich atmosphere, as has been suggested for Venus (Fegley et al. 1995). Magnetite has been reported...causes the formation of Ti-poor magnetite with maghemite, hematite, laihunite, and/or goethite (e.g., Banfield...al. 2016). Maghemite does not have a cataloged standard; therefore, to determine if maghemite was present...results were compared with results with known maghemite detections (Hanesch 2009). Raman spectra from...from the previous experimental work show that maghemite produces peaks at 350, 500, and 700 cm–1, which do
Journal (article/letter/editorial)
Goethite Pyrite Hematite, goethite Hematite, maghemite 2 8.9 Wendover, Utah Chichibu Mine, Saitama...goethite Pyrite, pyrrhotite (FeS, Fe7S8), magnetite, maghemite Magnetite Hematite Hematite Hematite 1.1 1.5...kaolinite, smectite, chlorite Chlorite Magnetite, maghemite, quartz Hematite Hematite, quartz 8–8.5 205–220...patterns of magnetite and maghemite are very similar, we distinguished maghemite from magnetite by the slight...slight shift toward higher angles of the maghemite peaks compared with those of magnetite (Chen et al
Journal (article/letter/editorial)
to extensive reheating of the magnetic carriers. Venus has no dynamo field and its surface temperature... Mercury 5.1 - 102~ 370 Ness et al. (1975) Venus < 8 • 1021 6 . 5 • 1 0 ~2 < 4 D o l g i n o v...o r y o f t h e planet. VENUS As s h o w n in Table I, t h e p l a n e t Venus e i t h e r has n o d e...a m o . T h e surface t e m p e r a t u r e o f Venus is sufficiently high, t h a t essentially n o material...means t h a t e x c e p t for very local effects, Venus can carry o n l y an e x t r e m e l y limited r
Journal (article/letter/editorial)
increases at 420–450 ºC, and unstable magnetite (maghemite) and monoclinic pyrrhotite with a well-defined...formation of magnetite (S-rich arsenopyrite) or maghemite (As-rich arsenopyrite) with a dramatic increase...different heating stages: hematite, magnetite, maghemite, and pyrrhotite (Kopp and Kerr, 1958); hematite...iron monosulfide, α-Fe, magnetite, hematite, and maghemite (Prasad et al., 1985). Heating in carbon dioxide...dioxide produces pyrrhotite, magnetite, maghemite, and hematite (Bhargava et al., 2009; Fegley et al., 1995)
Journal (article/letter/editorial)
(1σ ; 42.6 ± 5.3 μT after excluding possible maghemite-bearing zircons), which is consistent with high-precision...580 ◦ C, most likely indicating the presence of maghemite or titanohematite (Fig. 3). Gee et al. (2010)...remanent magnetization (TCRM) most likely carried by maghemite, although a primary remanence carried by titanohematite...demagnetization argues in favor of maghemite. On the other hand, maghemite usually undergoes inversion to...these high temperature components represent a maghemite-carried TCRM, their recovered paleointensities
Journal (article/letter/editorial)
silicate may not be just early condensate. For Venus, reviews are given o f the surfitce properties,...photochemically generated H20 2. Fe-rich layer silicates, maghemite, and Mg-sulphate may dominate the sediments. The...distant fast planetesimals. Only the Earth and Venus are big enough to retain debris from late volatile-rich...C and P. Mercury and Venus should have accreted reduced material, and only Venus should contain volatiles...constraints Comparison of suggested origins Mercury Venus: Surface properties Atmosphere Speculations on bulk
Book
materials mantling the surfaces of the Moon, Mars, Venus, Mercury, comets and the moons of the outer planets...range 7.5 to 10 Ma (late Miocene), for hematite/ maghemite separates from pisolitic nodules from the Morangup...sub-angular to rounded pisolites of goethite-hematite, maghemite and fossil wood, cemented in a goethitic matrix);...most is residual magnetite from parent rocks. Maghemite [g-Fe2O3] is also a spinel, although its formula...Written as a spinel, maghemite is [Fe8O12], compared with magnetite, [Fe9O12]. Maghemite can form by the oxidation
Journal (article/letter/editorial)
identified in sample BRhas by of maghemite γFe2 O3 [36–39]. Maghemite is a yellowish brown compound, which...considerably For brown, oxidesofdifferent from maghemite, constitute thedeepened. laser-induced heatingiron...areas, and the detection of the iron hydroxide maghemite, suggesting the use of lepidocrocite. The two...Siddall, R.; Mazzoli, C.; Nodari, L. The Temple of Venus (Pompeii): A study of the pigments and painting
Report (issue)
Cruikshank, and T. C. Owen Water on Mars and Venus.154 T. M. Donahue Nitrogen and its Isotopes in...Observations and Implications for Water in the Earth, Venus and Mars.221 A. Navrotsky and K. Bose Stability...Venusian evolution over 4.6 Gyr. In the case of Venus, there is the possibility that the Venusian mantle...oscillatory to quasi-steady circulation, i.e., Venus changed from an Earth-like planet to a Mars-like...for the investigation of the degassing history of Venus. INTRODUCTION The thermal history of a planet depends
Journal (article/letter/editorial)
spectroscopy in air and found that hematite, maghemite, and pyrrhotite were the thermal decomposition...pyrrhotites, to magnetite (Fe3 O4 ) by oxidation, to maghemite (γ-Fe2 O3 ), and finally to hematite (α-Fe2 O3...rate of pyrite decomposition on the surface of Venus. Icarus 1995, 115, 159–180. [CrossRef] Corradi,
Journal (article/letter/editorial)
inferred. As is seen, however, recent data from Venus cast considerable doubt on the validity of this...only. MARS WATER 95 More recent results from Venus suggest very strongly that the similitude assumption...assumption is not a valid one. Results from the Pioneer Venus large probe and bus mass spectrometers indicate...(Hoffman et aI1980). While there is evidence that Venus formerly had more water than is there presently...instead that the steep 36 Ar gradient observed from Venus to Earth to Mars reflects the decrease in nebular
Book
on the lithospheric-atmospheric interaction on Venus. The authors use the latest information on the composition...KHODAKOVSKY 4. Lithospheric-Atmospheric Interaction on Venus 106 136 V.P. VOLKOV, M.Yu. ZOLOTOV, AND I.L....6000 km and () ~ I in the region of the Earth and Venus, we obtain from Eq. (8) v ~ 7 km' S-l and eccentricities...material, the primitive atmospheres of the Earth, Venus, and Mars were formed. Mercury and the Moon formed...and structure of the upper shells of Earth and Venus is still far from solution. The problem of formation
Journal (article/letter/editorial)
the question of why Earth’s closest neighbours Venus and Mars evolved climatically into opposite directions...goethite and jarosite) and do not (e.g. hematite and maghemite) contain volatiles as a part of their structures...and the formation of hematite on the surface of Venus (Fegley et al., 1995, 1997) and basalt oxidation...and the formation of hematite on the surface of Venus. Icarus 118, 373–383. Fegley Jr., B., Klingelhöfer...interactions on Venus. In: Bougher, S.W., Hunten, D.M., Phillips, R.J. (Eds.), Venus II— Geology, Geophysics
Journal (article/letter/editorial)
contain ferromagnetic inclusions (magnetite or maghemite), with magnetic sizes ranging from superparamagnetic...in the upper mantle of rocky planets (Mercury, Venus, Earth, Mars), in meteorites and cosmic dust. The...at SIU to differentiate between magnetite and maghemite. The specimens chosen for this test did not display...ambiguous because it could result either from maghemite (in which the Verwey transition is suppressed;...post-synthesis oxidation seems unlikely. Instead, should maghemite be present we would rather put it to the account
Journal (article/letter/editorial)
magmas, (148) 299 Magellan Program, (145) 109 Maghemite, ( 15 1) 279 Magma chambers, ( 150) 261, (15 1)...259 U-238/U-234, (153) 251 Vegetation, (146) 83 Venus, (145) 109, (147) 1 Vesicular texture, (146) 555
Journal (article/letter/editorial)
and vacancy defects (i.e., solid solution with maghemite spinel: cFe2O3, or Fe3+3(Fe3+5h)O12). 4.2. Non-graphitic...that the Bonnickson sample contained significant maghemite solid solution, although its chemical analysis...recognizes that real material always has some maghemite solid solution. These approaches should yield...oxidation state of the lower atmosphere and surface of Venus. Icarus 125, 416–439. Flynn G. J., Keller L. P.
Report (issue)
Magnetic properties of the rocks containing maghemite (y Fe2O3 ) : Tokyo Univ., Geophys. Inst. Geophys...particular maghemite (y Fe2O3 ). The change of magnetic susceptibility with temperature of maghemite-free gabbro...zero. The heating curve of gabbro containing maghemite shows a pronounced peak at about 275 C, the temperature...of that containing maghemite is nearly 20 times greater than that of the maghemite-free gabbro. The natural...remanent magnetization of the gabbro containing maghemite is on the order of 10 times greater than the thermoremanent
Journal (article/letter/editorial)
compositional determinations) include nanophase goethite, maghemite, akagenite, and schwertmannite. The possible complications...SAK1 from Morris et al. (2000); < 90 µm) [2], maghemite (sample LPS2-3-265 from Morris et al. (2000);...intermediate regions Mars dark regions Akagenite Maghemite Schwertmannite Hematite Jarosite Lepidocrocite...ferric iron-bearing materials, such as hematite, maghemite, akagenite, schwertmannite, jarosite, lepidocrocite...material intimate mixture series; 1—akagenite; e—maghemite; P—schwertmannite; +—hematite; ×—jarosite; —lepidocrocite;
Journal (article/letter/editorial)
hydrous minerals and/or carbonates such as Mars, Venus, or C-type asteroids. As was pointed out by GILDING...minor amounts of lepidocrocite (y-FeOOH) and maghemite (FeZOj). Chlorine-containing akaganCite (up to...ages and transforms into mainly goethite and maghemite (BUCHWALDand CLARKE. 1989). Figure 5 compares
Journal (article/letter/editorial)
inferred from trace element and isotope systematics. Venus has suffered extensive volcanic resurfacing, whereas...and felsic silicate rocks from the Moon, Mars, Venus, and meteorites are reviewed and discussed in this...an origin in major planetary bodies, including Venus and Mercury, and demonstrates that they formed early...ferric aeolian dust and other minerals, probably maghemite or ferrihydrite. Refined chemical analyses of the...orbiters that fly, or have flight, over the Moon, Mars, Venus, Mercury and, more recently, some asteroids provide
Journal (article/letter/editorial)
Madagascar (164) 221, (170) 141 mafic magmas (167) 1 maghemite (167) 283 magma chambers (167) 61, (167) 311,...(168) 101 velocity structure (167) 131, (168) 187 Venus (171) 277 vertical movements (173) 7 Verwey transition
Journal (article/letter/editorial)
Impact-induced atmospheres and oceans on Earth and Venus. Nature 1986, 322, 526–528. [CrossRef] Matsui, T...S.C. Redox state of Earth’s magma ocean and its Venus-like early atmosphere. Sci. Adv. 2020, 6, 1–9. [CrossRef]...goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and maghemite (γ-Fe2O3). Am. Mineral. 2003, 88, 846–854. [CrossRef]...goethite (α-FeOOH), lepidocrocite (γ-FeOOH), and maghemite (γ-Fe2O3). Am. Mineral. 2003, 88, 855–859. [CrossRef]
Journal (article/letter/editorial)
(SUNG and MORGAN, 1980), which may revert to maghemite (y-Fe203), one of the candidate magnetic phases...(HARGRAVES et al., 1979; POSEY-DOWTY et al., 1986). Maghemite could also result from thermal decomposition of...the formation of oxyhomblendes and oxybiotites on Venus (BURNS and STRAUB, 1992). In some terrestrial environments...415-14,42 1. BURNSR. G. and STRAUBD. W. ( 1992) Venus surface mineralogy: Origin of the altitude-dependent...properties of submicron powders of hematite ((YFeZOr), maghemite ( y-Fe203), magnetite (Fe,O, ) , goethite ( LYFeQGH)
Journal (article/letter/editorial)
fractions: goethite (73%), haematite (14%) and maghemite (13%). It was originally chosen for its fine granular...variety of magnetic minerals including haematite, maghemite and Salten Soil-I. Although due to limited computing...Wind as a Geological Process on Earth, Mars and Venus, Cambridge Planetary Science Series. Cambridge University
Journal (issue)
amount of a very magnetic mineral, believed to be maghemite. The preferred explanation for the magnetic material...caused the iron to precipitate (drop out) as maghemite onto the silicate Martian dust. Dust devils, detected...the nearby Sun. Moreover, three of the planets (Venus, Uranus, and Pluto) rotate backwards. Uranus is...Disk) #332 Saturn #333 Eight-Planet Montage #340 Venus Special SaleAny Combination! 1 $7.00 each 2-3 6
 
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