Description: Northwest Africa 15923 Name: Northwest Africa 15923 This is an OFFICIAL meteorite name. Abbreviation: NWA 15923 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass 105 kg Meteoritical Bulletin: MB 112 (2023) Eucrite-melt brecciaRecommended: Eucrite-melt breccia This is 1 of 99 approved meteorites classified as Eucrite-melt breccia. Approved 7 May 2023 Writeup from MB 112: Northwest Africa 15923 (NWA 15923)(Northwest Africa)Find: 2022Classification: HED achondrite (Eucrite, melt breccia)History: Mark Lyon purchased 105 kg of similar looking fusion crusted achondritic meteorites from a meteorite dealer in Mauritania in 2022/2023. The largest stone is 12 kg. A 433.7 g stone was donated to the Buseck Center for Meteorite Studies at ASU.Physical characteristics: A fresh, fusion crusted angular stone with poorly developed regmaglypts. Fusion crust is locally glossy with well developed flow patterns. Sawn surface (7 × 5 cm) shows coarse breccia of light-colored rounded breccia clasts separated by dark vesicular melt veins with a matte-black appearance. Clasts are poorly sorted and range considerably in size, many measuring several centimeters.Petrography: (E. Mares, S. Ravikumar, L. Garvie, A. Wittmann, ASU) Eucrite-melt breccia with clasts to 5 cm with a distinct boundary to the black melt veins. Predominant minerals are up to 1-mm-sized exsolved pyroxenes and calcic plagioclase that exhibit gabbroic cumulate textures. All clasts appear similar in their modal mineralogies, suggesting the sample is a monomict breccia. Accessory phases include ilmenite, chromite, troilite, silica, F-rich Ca phosphate, Ca-Fe-Mg phosphate, and zircon. Small grains of ilmenite and chromite are present as inclusions within the pyroxene-plagioclase clasts. Troilite is primarily encountered as small rounded blebs within the melt veins. No metallic Fe-Ni detected.Geochemistry: Low-Ca pyroxene: Fs 61.9±1.1Wo2.6±0.9, FeO/MnO=31.71±0.89, n=10; augite: Fs27.7±0.9Wo42.9±0.9, FeO/MnO=33.33±1.35, n=10; Calcic plagioclase: An96.2±1.0Ab3.1±0.2, n=10. Silica contains 0.11±0.01 wt% Al, 0.24±0.12 wt% Fe and up to 0.1 wt% K (n=10). Chromite has variable Ti content (ranges from 1.3-9.1 wt% Ti; n = 4). Ilmenite is close to stoichiometric FeTiO3 with trace Mg, Mn, and Cr.Classification: This meteorite is a gabbroic monomict eucrite impact breccia.Specimens: One specimen (433.7 g) in the ASU Buseck Center for Meteorite Studies. Place of purchase:MauritaniaDate:2022Mass (g):105000Pieces:manyClass:Eucrite-melt brecciaShock stage:highWeathering grade:low I will combine the cost of shipping for all the items you win during a 2 week period that are paid for in a single transaction. Please note. If items are paid for separately, they will be shipped separately due to eBay tracking reasons. Also, I ship items within 24 hours from the time of payment. Therefore, do not pay for any items until you are done bidding so I can ship everything in one package. Please take your time and don't pay for up to 2 weeks. Shipping includes tracking and delivery confirmation. I am a member of the awesome Global Meteorite Association #GMA0021 Please only pay in one payment when you are all done. Postage is the same for all the items you win over a 2 week period. ONLY pay in ONE PAYMENT when you are all done winning and ready to buy everything you wanted. I mail out all items the same day or in the morning. Thanks, John Humphries, P.O. BOX 310, Tombstone, AZ 85638
Price: 42.99 USD
Location: Tombstone, Arizona
End Time: 2024-08-31T04:57:33.000Z
Shipping Cost: 6.49 USD
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Return shipping will be paid by: Buyer
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Item must be returned within: 30 Days
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Item+Type: Meteorites
Type+of+Mineral: meteorite
Item Type: Meteorite
