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Northwest Africa 4507
Basic information Name: Northwest Africa 4507
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4507
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 85 g
Meteoritical Bulletin:  MB 92  (2007)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 664 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 24 Jul 2007
Writeup from MB 92:

Northwest Africa 4507


Find: 2005

Achondrite (ureilite)

History: Purchased in 2006 at the Tucson Gem and Mineral Show.

Physical characteristics: Total mass, 85.0 g, a deformed parallelepiped piece with smaller top surface, 68x24x24 mm in size, external color is dark brown and no fusion crust is apparent.

Petrography: (H. Takeda, Chiba).The sample consists of olivine (up to 2.3x1.7 mm in size) and pyroxene. One PTS shows a typical ureilite texture with carbonaceous veins, in which Fe-metal and sulfide are present. Approximately one third of mafic silicates are pigeonite. A part of carbonaceous veins intrudes into an olivine crystal as a plate. Olivine crystals have minor cracks, but shock effect is minor. Some pigeonite grains show a twin texture.

Mineral compositions: Olivine Fo79-82 (core) and >Fo90 (rims).Major pyroxenes have pigeonite compositions (Fs19Wo10). A large olivine crystal contains a small ellipsoidal inclusion of pigeonite, 0.26x0.20 mm, with small regions of high-Ca (Fs14Wo35) and low-Ca (Fs17.3Wo4.8). Pyroxenes enclosed in thick rims of the small ellipsoidal inclusion of pigeonite within the olivine grain; another ellipsoidal inclusion (0.16x0.09 mm) has low-Ca pyroxene composition (Fs18.5Wo4.6). Microscopic observations and Raman analyses (T. Nakamuta, KyuU) show tiny diamond crystals occurring in blade-shaped graphite crystals.

Classification: Achondrite (ureilite); minimum weathering, minimum shock.

Type specimen: A total of 17.22 g of sample and one thin section are on deposit at NSMT. Hori holds the main mass.

Data from:
  Table 2
  Line 83:
Place of purchase:Tucson, Arizona, USA
Mass (g):85
Type spec mass (g):17.22
   and collections
KyuU: Department of Earth and Planetary Science, Kyushu University Hakozaki, Higashi-ku, Fukuoka-shi 812- 8581, Japan (institutional address)
Chiba: Chiba Institute of Technology, Tsudanuma, Narashino, Chiba 275-0016, Japan (institutional address)
Hori: Unknown person (private address; updated 17 Apr 2009)
NSMT: National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, JAPAN, Japan; Website (institutional address; updated 16 Jun 2014)
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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