NWA 4024 (9,930 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