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NWA 8261 Achondrite Eucrite Fragment weighing 0.99g

£22.50

In stock

NWA 8261 Achondrite Eucrite Fragment weighing 0.99g

 

Northwest Africa 8261
Basic informationName: Northwest Africa 8261
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8261
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 559 g
Classification
history:
Meteoritical Bulletin:MB 103  (2014)Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 350 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: AchondritesEucrites, and HED achondrites

Comments:Approved 18 May 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8261 (NWA 8261)

(Northwest Africa)

Purchased: 2014 Jan

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Kuntz in January 2014 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Polymict breccia composed predominantly of crystalline debris related to sparse lithic clasts of gabbroic eucrite, along with rare clasts of much finer grained, intersertal-textured eucrite, autolithic breccia clasts (i.e., breccia within breccia), and rare fragments of diogenitic orthopyroxene. Gabbroic eucrite clasts consist of exsolved pigeonite and polycrystalline calcic plagioclase with accessory silica polymorph, ilmenite, chromite, troilite and barite. Isolated grains of olivine, more ferroan augite, and ferroan pigeonite are also present.

Geochemistry: Diogenitic orthopyroxene (Fs23.9Wo2.3, FeO/MnO = 27), host orthopyroxene (Fs60.2Wo3.2, FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs28.9Wo41.4, FeO/MnO = 29), olivine (Fa54.0, FeO/MnO = 45), ferroan augite (Fs35.0Wo40.0, FeO/MnO = 29), ferroan pigeonite (Fs62.0Wo24.2, FeO/MnO = 30).

Classification: Eucrite, polymict breccia.

Specimens: 20.9 g including a polished thin section at UWB. The remainder is held by Kuntz.

Data from:
MB103
Table 0
Line 0:
Place of purchase:Erfoud
Date:P 2014 Jan
Mass (g):559
Pieces:26
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):54
Ferrosilite (mol%):23.9; 60.2; 28.9
Wollastonite (mol%):2.3; 3.2; 41.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.9
Type spec location:UWB
Main mass:F. Kuntz
Comments:K202; submitted by A. Irving