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  11 - July - 2019


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An MPOD Classic
from 11 July 2014

 
NWA 8409   contributed by Anne Black, IMCA 2356   MetBul Link
 


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99.1 grams.   Achondrite-ung

TKW 345 grams. Fall not observed. Found 2012 in southern Morocco.

Anne writes:
Fragment with green crust along one face.

Described by Dr. Irving as Ungrouped magnesian achondrite.

The specimens have an overall primary cumulate igneous texture, and are composed mainly of calcic plagioclase, Cr-bearing diopside (Fs1.8-2.2Wo44.3-43.8; FeO/MnO = 12-15) and forsterite (Fa4.5-4.6; FeO/MnO = 36-41) with accessory Cr-bearing troilite and kamacite. Lobate forsterite grains are commonly associated with elongate pores. Grain boundaries between plagioclase and diopside exhibit a complex texture consisting of plagioclase laths within diopside or vice-versa, together with finely distributed kamacite and troilite inclusions. This material is paired with NWA 7325 and NWA 8014.


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Tomorrow

Aguas Zarcas
Gourgues Denis

This Month

5 pictures in the Queue
Denis Gourgues
 7/11/2019 5:03:53 AM
SPECTACULAR, ANNE !!!!.. I seach always a little fragment with this fusion crust part (like the skin of a crocodile).
Graham Ensor
 7/11/2019 4:25:20 AM
Very nice Anne...one of the larger pieces I've seen.
 
 


Current server date and time: 7/24/2019 4:47:50 AM
Last revised 2/18/2019