On Offer: 7.26 gram NWA 8291 mesosiderite meteorite end piece.
Type: Mesosiderite
Found: 2013
Country: Morocco
Description: 7.26 gram specimen of NWA 8291 Mesosiderite meteorite. This is a "half cut" giving a collector / educator the best of both worlds, the natural exterior as well as a view to the interior.
What you get: 7.26 gram NWA 8291 Mesosiderite stoney-iron meteorite specimen as shown, storage/shipping membrane box, and Certificate of Authenticity.
I offer a 100% no questions asked 30 day .
SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW
Northwest Africa 8291Basic informationName: Northwest Africa 8291Northwest Africa 8291 (NWA 8291)
(Northwest Africa)
Purchased: 2013
Classification: Mesosiderite
History: Purchased by Brahim Tahiri from a Moroccan meteorite hunter and sent to his partner Sean Tutorow for classification, 2013.
Physical characteristics: 45 small stones that are visually identical, irregular dark exterior with some iron staining, saw cut reveals mm-sized, bright metal grains set in dark brown silicate matrix.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 70% silicate minerals and 30% metal. Silicate mineralogy ~70% pyroxene, ~25% plagioclase, accessory silica and olivine. Silicate grain sizes up to 300 m. Metal: ~90% kamacite, ~10% taenite, 5-10% of total metal is oxidized. Metal domains up to 3 mm. Many metal/oxide veinlets and blebs throughout.
Geochemistry: (C. Agee and H. Miley, UNM) EMPA. Low Ca-pyroxene Fs 32.4 7.0Wo 2.7 0.7, Fe/Mn=28 2 n=9, olivine Fa 31.7.7, Fe/Mn=43, n=1, plagioclase Or 0.5 0.1Ab 9.0 1.5An 90.5 1.6, n=7.
Classification: Mesosiderite
Specimens: 20.95 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.
