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Northwest Africa 12865
Basic information Name: Northwest Africa 12865
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12865
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 10.9 g
Meteoritical Bulletin:  MB 108  (2020)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Oct 2019
Writeup from MB 108:

Northwest Africa 12865 (NWA 12865)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite)

History: Catalogued in the ROM collection as LM57451

Physical characteristics: Visible fusion crust with low weathering, evident with minor light orange caliche in fractures. Interior of the sample is fresh, showing a coarse-grained cumulate texture. Only slight weathering on the inside of the sample.

Petrography: (K. Tait, I. Nicklin, ROM) Breccia composed of basaltic and gabbroic clasts and mineral grain fragments set in a finely comminuted matrix. The largest clast is 5 × 3 mm. One thin shock vein (0.5 mm maximum width) runs discontinuously across the thin section. Mineral grains in the clasts and matrix show undulose extinction.

Geochemistry: Mineral composition and geochemistry: Plagioclase An 87.9±1.4 (n = 28). Low-Ca pyroxene composition: Fs34.7±2.3Wo5.1±4.9 and Mg#32.6-41.8 (n=14). High-Ca pyroxene composition: Fs30.0±0.8Wo42.5±1.2, Mg#49.6-53.9 (n=10).

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2011
Mass (g):10.91
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):30.0±0.8, 34.7±3.7
Wollastonite (mol%):5.1±4.9, 42.5±1.2
Classifier:K. Tait, ROM
Type spec mass (g):2.2
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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