NWA 8048 ("Dimict" Eucrite) SOLD OUT

A 146.4g stone with some crust was purchased out of Morocco in August of 2013. I cut and prepared several initial slices myself and the classification was done by Dr. Anthony Irving, who determined the stone to be a dual lithology eucrite. This eucrite can technically be referred to as polymict, but because it remains unbrecciated it is more appropriate to label it ‘dimict’. Most slices feature a large and very fine grained clast which is crosscut with shock veins surrounded by scattered clasts of a second basaltic lithology consisting of a medium grained white and grey matrix. Dr. Irving’s explanation of this unusual eucrite is that it is a xenolith, the larger fine grained clast being engulfed by basaltic magma as it cooled. Most of the slices were cut thin to allow for the most surface to weight ratio, and each comes in a quality labeled meteorite display box.

Petrography as follows:
The specimen is consists of a large fine-grained, granulitic eucrite clast with attached basaltic eucrite material. Both lithologies are composed of exsolved pigeonite and calcic plagioclase with accessory ilmenite, silica polymorph, troilite and Ni-poor metal. Pyroxene in the granulitic portion consists of exsolution lamellae of augite (Fs27.3-28.2Wo42.7-41.9; FeO/MnO = 29-32) within host orthopyroxene (Fs61.5-61.9Wo3.1-2.1; FeO/MnO = 30-31); in the coarser, ophitic material augite lamellae are Fs26.7Wo42.3 (FeO/MnO = 29) and host orthopyroxene is Fs58.0Wo4.3 (FeO/MnO = 32). One explanation of this specimen is that the granulitic clast represents a xenolith engulfed in the igneous matrix.

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