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Northwest Africa 14483
Basic information Name: Northwest Africa 14483
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14483
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 784 g
Classification
  history:
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 56 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Nov 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14483 (NWA 14483)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite, melt breccia)

History: Purchased by Ken Regelman in 2017 from a Mococcan dealer.

Petrography: (A. Irving, UWS and J. Boesenberg, Brown U.) Complex breccia composed predominantly of closely packed microgabbroic eucrite clasts and related crystalline debris, plus <10 vol.% diogenitic orthopyroxene, together with very sparse, patchily distributed, ultrafine grained melt matrix (dark gray to opaque in thin section). Eucritic clasts and debris contain calcic plagioclase (some polycrystalline), exsolved pigeonite (some polycrystalline, some partly altered to red-brown Fe oxides), silica polymorph, chromite, troilite and Fe metal. Several grains of olivine with intermediate Fa contents (unlike those typically found in either diogenites or eucrites) and some patches of secondary calcite are present.

Geochemistry: Diogenitic orthopyroxene (Fs29.4-36.8Wo2.1-3.2, FeO/MnO = 26-34, N = 6), low-Ca pyroxene hosts (Fs58.5-62.3Wo3.1-1.9, FeO/MnO = 30-32, N = 2), augite exsolution lamellae (Fs26.3-29.0Wo41.6-41.2, FeO/MnO = 30-31, N = 2), pigeonite (Fs37.9-43.7Wo10.2-8.7, FeO/MnO = 27-32, N = 4), low-Ca pyroxene (Fs41.4-46.7Wo1.0-4.3, FeO/MnO = 25-33, N = 3), subcalcic augite (Fs27.8Wo28.6), olivine (Fa56.7-57.4, FeO/MnO = 47-49, N = 3), plagioclase (An80.8-95.6Or1.7-0.1, N = 7).

Classification: Eucrite (polymict melt breccia, shocked).

Specimens: 20.7 g including one polished thin section at UWB; remainder with Mr. K. Regelman.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):784
Pieces:1
Class:Eucrite-melt breccia
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):56.7-57.4
Ferrosilite (mol%):29.4-36.8; 58.5-62.3; 26.3-29.0; 41.4-46.7; 37.9-4
Wollastonite (mol%):2.1-3.2; 3.1-1.9; 41.6-41.2; 1.0-4.3; 10.2-8.9
Classifier:A. Irving, UWS, and J. Boesenberg, Brown U.
Type spec mass (g):20.7
Type spec location:UWB
Main mass:K. Regelman
Comments:Work name ARN21-1; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
ARN: Kenneth Regelman, Astronomical Research Network, 206 Bellwood Ave., Maplewood, MN 55117, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8037 approved meteorites from (Northwest Africa) (plus 1947 unapproved names)

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