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Northwest Africa 7058
Basic information Name: Northwest Africa 7058
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7058
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 13.7 kg
Meteoritical Bulletin:  MB 102  (2013)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 515 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 10 Dec 2013
Writeup from MB 102:

Northwest Africa 7058 (NWA 7058)

(Northwest Africa)

Purchased: 2006

Classification: Ureilite

History: Purchased by David Gregory and subsequently donated to ROM and NHM.

Physical characteristics: One piece, pebbly, wind-polished exterior, no remnant fusion crust, low weathering, minor caliche.

Petrography: (C. Smith, NHM) A typical textured ureilite consisting of mm-sized olivine with minor pyroxene, interstitial C-rich veins and masses and interstitial metal, most of which is oxidized. Olivine grains show clear reduction rims, with significant reduction occurring adjacent to C-rich masses.

Geochemistry: Olivine cores: Fa20.2 (Range Fa19.83-20.40, N=49). Cr2O3 0.67-0.80, MnO 0.44-0.44, CaO 0.30-0.36 (all wt%). Pyroxene cores Fs17.5Wo6.3 (Range Fs16.1-19.3Wo5.7-6.5, n=49), Cr2O3 1.1-1.15 wt%.

Classification: Achondrite (ureilite)

Specimens: Main mass, ROM. 50.12 g plus one thin section and two polished blocks at NHM.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2006
Mass (g):13700
Shock stage:low
Weathering grade:low
Fayalite (mol%):20.2
Ferrosilite (mol%):17.5
Wollastonite (mol%):6.3
Classifier:C. Smith, NHM
Type spec mass (g):46.22
Type spec location:NHM
Main mass:ROM
Comments:Submitted by Caroline Smith
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Gregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 7009 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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