9.22 grams NWA 15923 HED achondrite slice (Eucrite, melt breccia) Meteorite +COA For Sale

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9.22 grams NWA 15923 HED achondrite slice (Eucrite, melt breccia) Meteorite +COA:
$23.99

Northwest Africa 15923(NWA 15923)

(Northwest Africa)

Find: 2022

Classification: 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 atASU.

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: Fs61.9±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 theASUBuseck Center for Meteorite Studies.

I willcombine the cost of shipping for all the items you win during a 2 week periodthat are paid for in a single transaction. Please note. If items are paid forseparately, they will be shipped separately due to tracking reasons. Also,I ship items within 24 hours from the time of payment. Therefore, do not payfor any items until you are done offerding so I can ship everything in onepackage. Pleasetake your time anddon\'tpay for up to 2weeks.

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