NWA 6152 (1,600 g)

Northwest Africa 6152 (NWA 6152)
(Northwest Africa)
Purchased: 2010 Jan
Classification: Primitive achondrite (Brachinite)
History: Purchased in January 2010 by Hanno Strufe from a Moroccan dealer in Erfoud.
Physical characteristics: Eighteen small brownish stones with a total weight of 200 g.
Petrography: (A. Irving and S. Kuehner, UWS) Protogranular texture. Aggregate of predominantly olivine with subordinate orthopyroxene, clinopyroxene, chlorapatite, chromite, partly altered kamacite and troilite.
Geochemistry: Olivine (Fa30.6-30.7; FeO/MnO=63.7-66.7), orthopyroxene (Fs24.6-24.7Wo2.1; FeO/MnO=36.8-39.1), clinopyroxene (Fs9.8-10.2Wo43.6-43.2; FeO/MnO=28.1-29.6). Oxygen isotopes (D. Rumble, CIW): δ17O 2.23, 2.24; δ18O 4.65, 4.65; Δ17O -0.213, -0.210 per mil.
Classification: Brachinite. Although the mineralogy and mineral compositions are similar to those in NWA 5400 and paired stones, the oxygen isotopic composition is much different and precludes a pairing.
Specimens: A total of 21.4 g and one polished thin section are on deposit at UWS. The main masses are held by Mr. H. Strufe.
 
Place of purchase:
Erfoud
Date:
P 2010 Jan
Mass (g):
200
Pieces:
18
Class:
Brachinite
Shock stage:
low
Weathering grade:
moderate
Fayalite (mol%):
30.6-30.7
Ferrosilite (mol%):
24.6-24.7; 9.8-10.2
Wollastonite (mol%):
2.1±0.0; 43.8-43.2
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
21.4
Type spec location:
UWS
Main mass:
H. Strufe
Comments:
HS132; submitted by A. Irving