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Northwest Africa 7514
Basic information Name: Northwest Africa 7514
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7514
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 23.62 kg
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  R5
Recommended:  R5    [explanation]

This is 1 of 34 approved meteorites classified as R5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 18 Nov 2012
Revised 28 Nov 2012: corrected mass
Writeuphelp
Writeup from MB 101:

Northwest Africa 7514 (NWA 7514)

(Northwest Africa)

Found: Sept 2005

Classification: Rumuruti chondrite (R5)

History: Originally thought not to be a meteorite, and was received by the main mass holder as a gift from a meteorite collector in September 2005. Samples were given to Cascadia in June 2012 and subsequently recognized to be a meteorite.

Physical characteristics: The specimen contains large facets, regmaglypts, and is largely covered by a translucent fusion crust that appears olive gray. In places slight protrusions <1 mm high and ~1-4 mm across are present and covered by crust. A few small broken faces have a brownish weathering patina. A cut face shows a nearly featureless interior with an overall color more gray than that of the fusion crust.

Petrography: (A. Ruzicka and M. Hutson, Cascadia) In thin section the rock shows chondritic texture with a transparent matrix and significant chondrule-matrix integration. Indistinct microporphyritic and barred olivine chondrules are visible; a clast of olivine microporphyry ~4.5 × 3.6 mm across is the largest feature. The rock consists primarily of olivine, with subequal plagioclase and Ca-pyroxene, and accessory chromite, Cl-apatite, pentlandite, and pyrrhotite. Feldspar grain size (length) = 37±18 μm, n=199. Olivine grains show diverse shock characteristics split roughly evenly between stages S2, S3, and S4.

Geochemistry: Phases are generally equilibrated (all values atomic): olivine Fa38.2±0.5, n=32; plagioclase Ab84.4±2.0Or5.7±0.9An9.9±1.8, n = 20; Ca-pyroxene Wo40.1±2.5Fs15.4±1.9, n = 20; chromite [Fe/(Fe+Mg)] = 0.94±0.05, [Cr/(Cr+Al)] = 0.81±0.03, n=14; Ni-rich pentlandite (approximately Fe0.49Ni0.51S1.0) and S-rich pyrrhotite (approximately Fe0.81 Ni0.01S1.0). Oxygen isotope composition: (R. Greenwood, OU) δ17O = 5.74, δ18O = 5.04, Δ17O = 3.12 (all per mil).

Classification: Rumuruti chondrite (R5). Mineralogy, mineral chemistry, and O-isotopic composition consistent with R chondrite group.

Specimens: 40.3 g, two thick slices, and one thin section at Cascadia. Main mass, TStout.

Data from:
  MB101
  Table 0
  Line 0:
Date:Sept 2005
Mass (g):23620
Pieces:1
Class:R5
Shock stage:moderate
Weathering grade:W0
Fayalite (mol%):38.2
Classifier:Alex Ruzicka and Melinda Hutson, Cascadia
Type spec mass (g):40.3
Type spec location:Cascadia
Main mass:TStout
Comments:Submitted by Alex Ruzicka
Plots: O isotopes:  
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
TStout: Tim Stout, P.O. Box 181, Hillsboro, Oregon 97123, United States (private address; updated 15 Apr 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Tim Stout, Hillsboro, Oregon   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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