NWA 4024  (4,220 g)

NWA 4024 (4,220 g)

Northwest Africa 4024

Northwest Africa

Find: August 2005

Achondrite (winonaite)

History: The meteorite was found by an anonymous finder in the western part of the Sahara and bought by the main mass holder in Erfoud, Morocco.

Physical characteristics: A single stone of 38.1 g was recovered.

Petrography: (A. Greshake, MNB) 

The meteorite exhibits an equilibrium texture of low-Ca pyroxene, Ca-pyroxene, olivine, plagioclase, Fe,Ni-rich metal, and troilite with low-Ca pyroxene being the dominant silicate phase. Fe,Ni metal and troilite are dominant in several regions and no relict chondrules were found.

Mineral compositions and geochemistry: 

Olivine (Fa4.2), low-Ca pyroxene (Fs6.1), plagioclase (An11), determined by EMP.

Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ17O = 3.01, δ18O = 6.60, Δ17O = −0.42 (mean of 2; all ‰).

Classification: Primitive achondrite (winonaite); minimal shock, minimal weathering.

Type specimen: 

A total of 8 g plus one polished thin section are on deposit at MNB.

Hanno Strufe holds the main mass.

 

Place of purchase: Erfoud, Morocco
Date: 2005 Aug
Mass (g): 38.1
Pieces: 1
Class: Win
Shock stage: minimal
Weathering grade: extensive
Fayalite (mol%): 4.2
Ferrosilite (mol%): 6.1
Classifier: A. Greshake, MNB
Type spec mass (g): 8
Type spec location: MNB
Main mass: Hanno Strufe

 

 

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