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Northwest Africa 10299
Basic information Name: Northwest Africa 10299
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10299
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 339 g
Meteoritical Bulletin:  MB 104  (2015)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 3 Oct 2015
Writeup from MB 104:

Northwest Africa 10299 (NWA 10299)

Northwest Africa

Purchased: 2015 Feb

Classification: Martian meteorite (Shergottite)

History: One stone was purchased from an anonymous Moroccan dealer in Tucson, February, 2015.

Physical characteristics: The meteorite of 339 g has irregular shape, dark-brown spotted surface, and fusion crust is absent.

Petrography: (C.A. Lorenz, Vernad) The rock of coarse-grained subophitic texture, consists of an elongated prismatic grains of clinopyroxene (67 vol%, 0.7-3.0 mm) and interstitial prismatic plagioclase grains (23 vol%, 0.3-1.0 mm). Plagioclase is almost completely transformed to maskelinite, but several grains preserved the crystal structure at the grain edges. Pyroxene strongly fractured, twinned, with mosaic extinction. Plagioclase is almost completely maskelynitized. Fine-grained aggregate of silica and feldspar occur in interstitials between clinopyroxene crystals. Melt pockets of glass with bubbles are presented (5 vol%). Accessory phases are fayalite, sulfide, Ti-magnetite, ilmenite, chromite, apatite, baddeleyite. Weathering products are barite and calcite.

Geochemistry: Mineral compositions and geochemistry: (Borisovsky S.E., IGEM, EPMA) Pyroxene is Fs23-79En9-65Wo7.4-35. The zoned pyroxene typically ranges from cores Fs27En33Wo40 to rims Fs68En11Wo19. FeO/MnO = 34.2 ± 5.1. Pigeonite, Fs54±13En31±14Wo15±3 (in average, n=26); augite Fs29±10En40±8Wo31±4 (in average, n=23). Plagioclase An55±4Ab43±4Or2.4±1.8 (in average, n=17) and varies An48-61Ab38-51Or0.9-6.3.

Classification: Martian (shergottite). The meteorite is moderately weathered.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2015 Feb
Mass (g):339
Class:Martian (shergottite)
Classifier:M. A. Ivanova, C.A. Lorenz, Vernad
Type spec mass (g):22.5 g and thin section
Type spec location:Vernad
Main mass:anonymous
Comments:Submitted by M. A. Ivanova
   and collections
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
IGEM: Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetny Per., 35, Moscow, 119017 , Russia (institutional address; updated 16 Dec 2010)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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