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Northwest Africa 4508
Basic information Name: Northwest Africa 4508
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4508
Observed fall: No
Year found: 2001
Country: (Northwest Africa)
Mass:help 182 g
Meteoritical Bulletin:  MB 92  (2007)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 594 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 24 Jul 2007
Writeup from MB 92:

Northwest Africa 4508

Northwest Africa


Achondrite (ureilite)

History: Purchased in Rissani, Morocco in April 2001.

Physical characteristics: One subrounded blocky mass (5x3x2 cm) of 182 g and covered with dark brown, moderately weathered fusion crust.

Petrography: (H. Takeda, Chiba and A. Yamaguchi, NIPR). The sample contains fine-grained, granoblastic olivine, partly darkened pyroxene with carbonaceous (graphite) veins at grain boundaries. Minor weathering and heavily shocked. A few grains of pyroxene or olivine crystals form larger grains (0.7x0.4 to 3x1 mm). An original olivine crystal is broken into many very fine crystallites to show a granoblastic texture. There is an unusual texture of pyroxene crystals found in one of the sections studied.

Mineral compositions and geochemistry: Olivine (Fo83-86 [cores], up to Fo89 [rims]); pigeonite (Fs14Wo7; Wo6-10 range). Oxygen Isotopes: (M. Kusakabe, OkaU) δ17O = 2.97, δ18O = 7.66 (both ‰).

Classification: Achondrite (ureilite).

Type specimen: A total of 20.2 g of sample and one thin section are on deposit at NIPR. Fectay holds the main mass.

Data from:
  Table 2
  Line 84:
Place of purchase:Rissani, Morocco
Mass (g):182
Type spec mass (g):20.2
Plots: O isotopes:  
   and collections
NIPR: Antarctic Meteorite Research Center, National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan; Website (institutional address; updated 9 Dec 2013)
Chiba: Chiba Institute of Technology, Tsudanuma, Narashino, Chiba 275-0016, Japan (institutional address)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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