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Northwest Africa 2853
Basic information Name: Northwest Africa 2853
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2853
Observed fall: No
Year found: 2004
Country: Morocco
Mass:help 1000 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 378 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 3 Feb 2006
Revised 9 Sep 2006: Changed to howardite
Writeuphelp
Writeup from MB 90:

Northwest Africa 2853

Morocco

Find: 2005

Achondrite (howardite)

History: A 1006 g fully crusted stone was purchased in Erfoud, Morocco, in 2005.

Petrography: (T. Bunch and J. Wittke, NAU) Contains heterogeneously distributed orthopyroxene fragments that tend to be large (2–9 mm in diameter). Diogenite modes for three thin sections give 0, 9, and 15 vol%. Eucrites have a fine- to coarse-grained size range and consist of subophitic and cumulate textured basalts. Most pyroxenes recrystallized into small, polygonal aggregates; plagioclase melted, although original grain boundaries are preserved and crystallized into fine-grained fibrous to radiating textures.

Geochemistry: Host: Pigeonite (Fs45.3–51.7Wo5.8–9.0; FeO/MnO = 29–33), exsolution lamellae (Fs33.6–39.4Wo19.0–25.4). Diogenite: Orthopyroxenes (Fs22.6–25.6Wo1.8–2.3; FeO/MnO = 24–27), plagioclase (An89–94.3).

Classification: Achondrite (howardite); high shock.

Specimens: A 22 g type specimen is on deposit at NAU. Regelman holds the main mass.

Data from:
  MB90
  Table 2
  Line 139:
Place of purchase:Unknown
Date:2004
Mass (g):1000
Pieces:1
Class:How
Shock stage:High
Classifier:J. Wittke and T. Bunch
Type spec mass (g):22
Type spec location:NAU
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1466 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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