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Northwest Africa 6514
Basic information Name: Northwest Africa 6514
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6514
Observed fall: No
Year found: unknown
Country: (Northwest Africa)
Mass:help 3.2 kg
Recommended:  LL(L)3.1    [explanation]

This is the only approved meteorite classified as LL(L)3.1.
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 31 Jan 2011
Writeup from MB 99:

Northwest Africa 6514 (NWA 6514)

(Northwest Africa)

Classification: LL(L)3.1

History and physical characteristics: Since 2009, the type specimen has been present at the ROM.

Petrography: (Levke Kööp, UTorG) The main components of this meteorite are chondrules and opaque matrix. Chondrules, chondrule fragments and mineral fragments account for roughly 70% of the total volume. Chondrule diameters range from 0.25 to > 3 mm, with a mean of 0.8 mm. Optically isotropic mesostasis is present in many chondrules. Metal occurs as inclusions in silicate chondrules and in metal-sulfide spherules and nodules. Half of the larger olivine grains show undulatory extinction.

Geochemistry: Olivine ranges from Fa0.3 to Fa33.2. The mean is Fa12.1 (PMD 56%, N=84). Although many olivine grains exhibit FeO poor cores and FeO rich mantles, the mean of grain mantle analyses is also below 15 mol% fayalite. The mean Al2O3, Cr2O3 and CaO contents in olivine are 0.09 wt%, 0.34 wt% and 0.21 wt% respectively. With a mean of 0.33 wt%, FeO poor olivines (< 2 wt% FeO) are enriched in CaO. The Cr2O3 content in ferroan olivines (> 2 wt% FeO) ranges from 0.10 to 0.67 wt%, with a mean of 0.34 wt%. Low-Ca pyroxenes have a mean of Fs12.0 Wo1.2 and range Fs1.9-31.6.

Classification: The meteorite is an ordinary chondrite (LL or L3). The iron group cannot be inferred from the mean fayalite content in olivine as the meteorite is too unequilibrated. The low metal content (< 3 vol%) and the large chondrule sizes (0.8 mm) suggest that it belongs to either the L or the LL group. Based on the medium Cr2O3 levels in ferroan olivines, the meteorite may be classified as a 3.1 subtype. Shock and weathering stages are S2 and W2 respectively, respectively.

Specimens: Type specimen mass of 40 g and consists of a slab (22 g), multiple smaller pieces and two thin sections. All of these are located at the ROM. The holder of the main mass (3200 g) is anonymous.

Data from:
  Table 0
  Line 0:
Mass (g):3200
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):0.3 to 33.2, mean is 12.1
Ferrosilite (mol%):1.9 to 31.6, mean 12.0
Classifier:Levke Kööp, UTorG
Type spec mass (g):40
Type spec location:ROM
Main mass:anon
Comments:Submitted by Levke Kööp
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
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     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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