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Northwest Africa 7030
Basic information Name: Northwest Africa 7030
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7030
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 224 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL7
Recommended:  LL7    [explanation]

This is 1 of 59 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 21 Jun 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 7030 (NWA 7030)

(Northwest Africa)

Purchased: 2011 Oct

Classification: Ordinary chondrite (LL7)

History: Purchased by GHupé in October 2011 from a dealer in Zagora, Morocco.

Physical characteristics: A fresh stone (224 g) covered by black, glossy fusion crust, except at one end where the slightly stained, greenish-gray interior is visible. There are two distinct lithologies present and the minor lithology is distinctly green in color.

Petrography: (A. Irving and S. Kuehner, UWS) The major lithology consists of an aggregate of olivine, clinopyroxene, sodic plagioclase, chromite, troilite and taenite. A subordinate lithology is a very fresh, medium-grained, igneous-textured achondrite composed mostly of olivine and orthopyroxene with ~8 vol.% intercumulus potassium feldspar, albitic plagioclase (some with exsolved K-feldspar lamellae), clinopyroxene, and accessory taenite, troilite, chromite and kamacite. The latter lithology contains much less troilite than the major lithology.

Geochemistry: Olivine (Fa29.1-29.3, N = 4), orthopyroxene (Fs23.4-23.7Wo3.7-2.8), clinopyroxene (Fs11.6-12.6Wo39.8-39.2), plagioclase (An12.6-13.9Or2.2-2.3). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave (all in per mil) δ17O = 4.414, 4.357, δ18O = 6.235, 6.059, Δ17O = 1.129, 1.164 (for a TFL slope of 0.527). Bulk composition (R. Conrey, WSU): analysis of clean wire-saw cutting dust representative of the entire specimen by X-ray fuorescence spectrometry gave (in wt.%) SiO2 = 39.7, TiO2 = 0.11, Al2O3 = 2.6, Cr2O3 = 0.56, FeO = 23.11, MnO = 0.35, MgO = 25.9, CaO = 1.92, Na2O = 1.0, K2O = 0.23, P2O5 = 0.18.

Classification: Ordinary chondrite (LL7, potassic). There are no chondrules evident in either lithology of this unusual specimen; however, its oxygen isotopic composition and bulk major element composition establish an affinity with LL chondrites. The relatively high abundance of K-feldspar in the green pyroxene-rich lithology is an anomalous feature.

Specimens: 20.1 g and one large polished thin section are at UWB. The remaining material is held by GHupé.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2011 Oct
Mass (g):224
Pieces:1
Class:LL7
Shock stage:low
Weathering grade:low
Fayalite (mol%):29.1-29.3
Ferrosilite (mol%):23.4-23.7
Wollastonite (mol%):3.7-2.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:GHupé
Comments:Submitted by A. Irving
Plots: O isotopes:  
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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
WSU: Washington State University Pullman, WA 99164-2812, United States (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6759 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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