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NWA 4024

Sahara
Found in 2005
Winonaite
Total mass  > 38.1g

Specimen in collection :
1.86g endcut

 

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. HSSH holds the main mass.