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Northwest Africa 13470
Basic information Name: Northwest Africa 13470
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13470
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 104 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 502 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13470 (NWA 13470)

(Northwest Africa)

Purchased: Sept 2020

Classification: HED achondrite (Eucrite)

History: The meteorite was bought by the main mass holder from a local meteorite dealer in Mauretania.

Physical characteristics: Light-grayish rock with minor fusion crust.

Petrography: The meteorite displays a greyish to light greenish interior and is a polymict breccia composed of up to 1 cm sized basaltic, black impact melt, and mineral clasts set into a fine-grained clastic matrix. Mineral phases are predominantly exsolved pyroxene and calcic plagioclase; some magmatically zoned low-Ca pyroxenes are present attesting to a low degree of thermal metamorphism. Minor phases include silica, ilmenite, chromite, and troilite. No metallic iron has been detected. The meteorite contains shock melt veins.

Geochemistry: zoned low-Ca pyroxene: Fs40.7±9.4Wo5.9±0.7 (Fs29.2-52.9Wo5.1-7.5, FeO/MnO=24-33, n=18); low-Ca pyroxene host to augite exsolution lamellae: Fs58.8±0.4Wo1.6±0.1 (Fs57.9-59.7Wo1.4-1.7, FeO/MnO=28-30, n=13); Ca-pyroxene exsolution lamellae: Fs24.4±0.7Wo42.9±0.7 (Fs23.7-26.0Wo41.3-43.8, FeO/MnO=25-29, n=12); calcic plagioclase: An88.8±0.4 (An87.9-89.3, n=13)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P Sept 2020
Mass (g):104
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):40.7; 58.8; 24.4
Wollastonite (mol%):5.9; 1.6; 42.9
Classifier:A. Greshake, MNB
Type spec mass (g):20.0
Type spec location:MNB
Main mass:Lucian Cojocaru
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7741 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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