NWA 11504 (Monomict Eucrite)

Many small fresh stones were purchased out of Morocco in September of 2017. At about the same time, Michael Farmer was also purchasing several stones from this same recovery while visiting Morocco. The finders reported that a fall was observed on April 15th, 2016 in Algeria and recently recovered. The finders did not report the coordinates of the recovery, thus only allowing this classification to be classified as a find at best. A sample of this stone was sent to Dr. Carl Agee who determined the stones to be  Monomict Eucrite’s with  low weathering and high shock grades. They feature a rich brown/black and quite glassy fusion crust usually notable on only very early recovered falls.  Less than 2kg of this material was recovered. PHOTOS DO NOT DO THESE STONES JUSTICE!!!

Petrography as follows:

Fine-grained breccia of primarily pyroxene and plagioclase grains. pigeonite Fs60.0±2.0Wo4.7±2.2, Fe/Mn=33±2, n=11; high Ca pyroxene Fs35.5Wo33.1, Fe/Mn=34, n=1; plagioclase An86.2±5.0Ab12.9±4.5Or0.9±0.5, n=3.

Meteoritical Bulletin entry here. Submission below:

Northwest Africa 11504
Algeria
Purchase Date: 2017
Purchase place: Morocco
Mass: 1869.14 g
Type specimen mass: 27.14 g
Pieces: Several
Class: Eucrite-mmict
Shock: high
Weathering grade: low
Fa:
Fs: 60.0±2.0
Wo: 4.7±2.2
Classifier: C. Agee, UNM
History: Reportedly fell in western Algeria on April 15, 2016, however no coordinates or other information are available. Purchased by Michael Farmer in Morocco, 2017.
Physical: Several identical appearing pieces found together, shiny black fusion crust exterior, broken surfaces reveal a very fresh, fine-grained breccia of white and gray grains.
Petrography: (C. Agee, UNM) This meteorite is a fine-grained breccia of primarily pyroxene and plagioclase grains.
Geochem: (C. Agee, UNM) pigeonite Fs60.0±2.0Wo4.7±2.2, Fe/Mn=33±2, n=11; high Ca pyroxene Fs35.5Wo33.1, Fe/Mn=34, n=1; plagioclase An86.2±5.0Ab12.9±4.5Or0.9±0.5, n=3.
Classification: Monomict eucrite
Specimens: 23 g including a probe mount on deposit at UNM, 4.15 g on deposit PSF, Michael Farmer holds 1 kg, Adam Aaronson holds 700 g, Aras Jonikas holds 142 g.
Submitter: C. Agee

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