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NWA 4024

Found Sahara, 2005

Primitive Achondrite

Winonaite

Specimen is a 0.88g endcut

 

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.

9300元台幣

下圖為0.67克

7300元台幣

NWA 4024

 

 

NWA 4024

Found Sahara, 2005

Primitive Achondrite

Winonaite

Specimen is a 1.06g endcut

9600元台幣



 
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