"For auction is NWA 13905, a highly shocked L6 meteorite approved by experts. This flight-oriented piece, weighing 436.87 grams, is the main mass of this fall and features a striking appearance resembling a shark. Discovered in Mauritania in 2020, this meteorite consists of twenty identical stones with smooth sand-blasted surfaces. Upon closer inspection, light brown and gray grains, distinct chondrules, and a dark gray groundmass can be observed on saw-cut surfaces. Notably, polished cut-faces reveal visible shock melt veins. Petrographic analysis by C. Agee at UNM shows porphyritic and barred chondrules, recrystallized silicates, Fe/Ni-metal, troilite, and plagioclase grains up to ~200 μm in size. Bid with confidence as all meteorites come with a Certificate of Authenticity. Happy bidding!"

NWA 13905

Observed fall:No

Year found:2020

Country:(Northwest Africa)

Mass:2.2 kg:

Recommended:L6

This is 1 of 11509 approved meteorites (plus 6 unapproved names) classified as L6.

Northwest Africa 13905(NWA 13905) (Northwest Africa)

Purchased: 2020

Classification: Ordinary chondrite (L6)

History: Purchased from Mostafa Hnini in December 2020. Physical characteristics: Twenty identically appearing stones found together. All stones have smooth sand blasted exterior surfaces. Saw-cut surfaces reveal light brown and gray grains, a few distinct chondrules, all of which are set in a dark gray groundmass. Distinct shock melt veins are clearly visible in polished cut-faces.

Petrography: (C. Agee,UNM) Microprobe examination of a polished mount shows a few porphyritic and barred chondrules, the groundmass consists of recrystallized silicates, Fe,Ni-metal, and troilite. Plagioclase grains are up to ~200 m in size.

Geochemistry: (C. Agee,UNM) Olivine Fa24.10.3, Fe/Mn=472, n=8; low-Ca pyroxene Fs20.10.2Wo1.70.2, Fe/Mn=281, n=6.

Classification: Ordinary chondrite L6 Specimens: 70.85 g on deposit atUNM, Matthew Stream holds the main mass.

:Place of purchase:Mauritania

Date:P 2020

Mass (g):2.2 kg

Pieces:20

Class:L6

Shock stage:S4

Weathering grade:W2

Fayalite (mol%):24.10.3Ferrosilite (mol%):20.10.2Wollastonite (mol%):1.70.2

Classifier:C. Agee, UNMType spec mass (g):70.85Type spec location:UNMMain mass:Matthew StreamComments:Field name MST-3; submitted by C. Agee, UNM