17-2
Nouvelle-Aquitaine Météorite Chizé de Mars Orientée masse principale 2333 grammes du 05 novembre 2012 18h45 ...
....pour recherches ..... en bas à gauche échantillon N° 2 de 6.47 grammes minéraux avec croûte en fusionnement ....trés rare .... celà accrédite un long parcourt dans l 'atmosphére terrestre ... sur 18 témoins connus site ceidehom et caméra de surveillance à Caen France photo hervejpchotard@gmail.com réalisation
Échantillon croute de fusion météorite chizé de mars N°2 de 6,47 gr qui sera fractionné en 0.16 gr.
NWA 998 est un cumulat de pyroxènes, et elle a donc été classée parmi les Nakhlites. Friable et de couleur vert sombre, la roche présente des traces brun-orange d'altération, qui a probablement eu lieu sur Mars. La météorite est principalement constituée de cristaux d'olivine et de pyroxènes (clinopyroxènes et dans une moindre mesure orthopyroxènes), noyés dans une pâte interstitielle composée de plagioclases, d'oxydes (titanomagnétite, parfois en association symplectique avec les pyroxènes), de sulfures (pyrrhotite) et de phosphates (chlorapatite). | 
NWA 998 Martian meteorite, Algeriahttps://www.mindat.org/loc-236959.html Northwest Africa 998
Algeria or Morocco
Purchased 2001 September
Martian meteorite (nakhlite)
A. and G. Hupé (xHupé) purchased, from dealers at the Tucson Gem and Mineral Show in 2002 February, the main mass from a 456 g stone that had been acquired at an unspecified site in western Algeria or eastern Morocco in 2001 September. Dimensions before cutting: 72 mm by 65 mm by 48 mm. Classification and mineralogy (A. Irving and S. Kuehner, UWS): a friable, dark green rock with minor orange-brown alteration products that probably are of pre-terrestrial origin. It is composed mainly of subhedral, olive-green, complexly zoned subcalcic augite (Fs22Wo39) with subordinate yellow olivine (Fa64), orthopyroxene (Fs49Wo4), interstitial plagioclase (Ab61Or4 containing 0.1 wt% SrO, and exhibiting normal birefringence), titanomagnetite, chlorapatite and pyrrhotite. The overall texture is that of a hypabyssal, adcumulate igneous rock, and the apparent crystallization sequence is olivine, orthopyroxene, titanomagnetite, augite, apatite, plagioclase. There is a weak preferred orientation of prismatic pyroxene crystals, many of which have very distinctive zoning, with cores of augite surrounded by irregular, inverted pigeonite rims (now consisting of orthopyroxene with fine augite lamellae). Trains of tiny melt inclusions are present along healed fractures within pyroxene; microprobe study confirms that most of these are K-Na-Al-bearing silicate glass, but some are intergrowths of glass and Fe-bearing carbonate, which may represent quenched immiscible silicate-carbonate liquids. Symplectitic intergrowths of titanomagnetite and low-Ca pyroxene are present at grain boundaries between large, discrete olivine and titanomagnetite grains, but are not present around chromian titanomagnetite inclusions within olivine. These observations suggest that a pre-terrestrial oxidation process produced the symplectites, and involved high temperature, deuteric fluid infiltration along grain boundaries; such fluids also may have produced the irregular pigeonitic rims on augite crystals. Secondary (probably pre-terrestrial) ankeritic carbonate, K-feldspar (some Fe-bearing), serpentine (?), calcite and a Ca sulfate are present on grain boundaries and within cracks in augite. Oxygen isotope composition (D. Rumble, CIW): replicate analyses of acid-washed augite by laser fluorination gave δ18O = +3.9 ± 0.2‰; δ17O = +2.4 ± 0.1‰; ∆17O = +0.30 ± 0.02‰. Specimens: type specimens, 20 g, UWS, 20 g, FMNH, and two polished thin sections, UWS; main mass, xHupé.
Data from:
MB87
Table 8
Line 32:
Origin or pseudonym: Morocco/Algeria
Place of purchase: Tucson, Az
Date: Sep 2001
Mass (g): 456
Pieces: 1
Class: Martian
Classifier: A. Irving, UWS
Type spec mass (g): 40
Main mass: ROM
Comments: see separate entry
Plots: O isotopes:
Institutions
and collections FMNH: Department of Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 16 Nov 2011)
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
xHupé: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
Find references in NASA ADS: NASA ADS
Find references in Google Scholar: Google Scholar
Photos:
Credit Photos
Photos uploaded by members of the Encyclopedia of Meteorites.
(Caution, these are of unknown reliability)
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Geography:
Coordinates: Unknown.
Statistics:
This is 1 of 5736 approved meteorites from (Northwest Africa) (plus 2073 unapproved names)
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Revision
history:
Revision history This lists important revisions made to data for this record....................................THANK S |
