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Northwest Africa 13516
Basic information Name: Northwest Africa 13516
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13516
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 546 g
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 101 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13516 (NWA 13516)

(Northwest Africa)

Purchased: 2020 Sep

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purportedly found in the Adrar region, Algeria. Bought from a meteorite dealer in Tindouf, Algeria.

Physical characteristics: Isometric individual without fusion crust.

Petrography (K. Metzler, IfP): Unbrecciated coarse-grained basalt with ophitic to subophitic texture, consisting of about 60% pyroxene and 40% plagioclase. Pyroxene with augite exsolution lamellae (typical width 1-4 µm). Accessories are a silica polymorph, ilmenite, chromite, and traces of Ni-poor metal.

Geochemistry: Mineral compositions and geochemistry: Composition of low-Ca pyroxene: Fs55.1±0.7 Wo3.2±0.3 (Fs54.1-56.3 Wo2.7-3.6); mean Fe/Mn (at.): 33.1; n=10. Composition of Ca-rich pyroxene (exsolution lamellae): Fs25.8±1.5Wo39.0±2.2 (Fs24.7-29.0Wo35.1-41.2); n=9. Composition of plagioclase: An88.3±1.3Or0.2±0.3 (An86.7-90.6Or0.0-0.5); n=10.

Classification: Unbrecciated eucrite

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2020 Sep
Mass (g):546
Pieces:1
Class:Eucrite-unbr
Shock stage:M-S1
Weathering grade:low
Ferrosilite (mol%):55.1±0.7, 25.8±1.5
Wollastonite (mol%):3.2±0.3, 39.0±2.2
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Salamu Ali, Stockholm, Sweden
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7482 approved meteorites from (Northwest Africa) (plus 1988 unapproved names)

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