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NWA 13631  (1,973 g)

NWA 13631 (1,973 g)

Northwest Africa 13631 (NWA 13631)

(Northwest Africa)

Purchased: 2016

Classification: Carbonaceous chondrite (CR2)

History: The meteorite was purchased from a dealer in Morocco.

Physical characteristics: Dark-brownish fragment without fusion crust.

Petrography: Carbonaceous chondrite composed of abundant, mostly rounded, sometimes slightly flattened chondrules with an apparent mean diameter of about 700 µm and about 30% almost black matrix. Chondrules are predominatly of type I; one type II chondrule present. Some chondrules are metal-decorated and contain 150-200 µm sized metal blebs typical of CR. CAIs are sparse; only one has been encountered in the section studied. Low matrix totals suggest presence of hydrous mineral phases.

Geochemistry: olivine in type I chondrules: Fa2.7±0.7, Cr2O3: 0.73±0.12 wt%, n=15; low-Ca pyroxene: Fs3.3±0.8Wo0.8±0.1, n=12; olivine in type II chondrules: Fa19.3±6.8 (Fa13.9-31.0, n=7). Matrix analyses yield an average total of 84.8±1.1 wt% (5 µm defocused beam, N=12) suggesting the presence of hydrous minerals.

 

Place of purchase: Morocco

Date: P 2016

Mass (g): 81

Pieces: 4

Class: CR2

Shock stage: S2

Weathering grade: W2

Fayalite (mol%): 2.7; 19.3

Ferrosilite (mol%): 3.3

Wollastonite (mol%): 0.8

Classifier: A. Greshake, MNB

Type spec mass (g): 16.5

Type spec location: MNB

Main mass: Philippe Schmitt-Kopplin

Comments: Submitted by Ansgar Greshake

 

    60,00 €Preis
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