Meteorite NWA 10023 - Pallasite Full Slice (Anomalous - Plessitic)
Item History & Price
| Reference Number: Avaluer:4467629 |
NWA 10023 NWA 10023Stony-IronPallasiteAnomalous, plessitic metal matrix Specimen is a 3.01g full sliceCOMBINED SHIPPING : 5$ per package Northwest Africa 10023Basic informationName: Northwest Africa 10023
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10023
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 6.95 kg
Classificati...on
history:Recommended: Pallasite, PMG-an
This is 1 of 13 approved meteorites classified as Pallasite, PMG-an.
Comments:Approved 16 Mar 2015WriteupWriteup from MB 104:
Northwest Africa 10023 (NWA 10023)(Northwest Africa)Purchased: 2014Classification: Pallasite (Main group, anomalous)History: Purchased from Rachid Chaoui in December 2014, reportedly found near the Moroccan/Algerian border.Physical characteristics: One piece. Polished saw cuts show angular, orange-brown-green, translucent olivine; some grains up to ~2 cm in size. Metal makes up approximately 30-40%25 of this meteorite. There is only minor oxidation present.Petrography: (C. Agee, UNM) The etched surface of this pallasite shows approximately 98%25 of the metal consisting of very fine-grained (<1 µm) plessite, whereas kamacite occurs only as a thin mantling around olivine crystals. Olivine is the only silicate phase present. Accessory schreibersite, chromite, Ni-rich sulfide, and Ca-Mg phosphates were observed.Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa12.7±0.6, Fe/Mn=47±3, n=8; plessite Fe=84.0±1.2, Ni=15.4±0.7, Co=0.55±0.08 (all wt%25), n=4; kamacite Fe=93.1±3.0, Ni=5.9±0.2, Co=0.88±0.13 (all wt%25), n=4; schreibersite Fe=58.8±5.1, Ni=27.9±2.1, Co=0.22±0.00, P=14.8±0.08 (all wt%25), n=2; Fe-Ni sulfide Fe=49.9, Ni=16.1, Co=0.24, S=33.9 (all wt%25), n=1. Likely farringtonite Mg3(PO4)2 and stanfieldite Ca3Mg3(PO4)4 detected in EDS. Oxygen isotopes (K. Ziegler, UNM): 7 acid-washed fragments analyzed by laser fluorination gave, respectively d18O= 3.667, 3.554, 3.167, 3.143, 3.608, 3.887, 3.368; d17O= 1.693, 1.630, 1.440, 1.458, 1.668, 1.753, 1.572; ?17O= -0.243, -0.247, -0.232, -0.202, -0.237, -0.299, -0.206 (linearized, all per mil), mean value d18O=3.485±0.273, d17O=1.602±0.118, ?17O=-0.238±.032 (TFL slope=0.528).Classification: Pallasite, PMG-an. An unusually high amount of the metal is in the form of plessite. Oxygen isotopes indicate an affinity to the pallasite main group.Specimens: 20.3 g including a probe mount on deposit at UNM, DPitt holds the main mass.Data from:
MB104
Table 0
Line 0:Place of purchase:MoroccoDate:P 2014Mass (g):6950Pieces:1Class:Pallasite, PMG-anShock stage:lowWeathering grade:lowFayalite (mol%25):12.7±0.6Classifier:C. Agee, UNMType spec mass (g):20.3Type spec location:UNMMain mass:Darryl PittComments:Submitted by C. Agee Check out my other items!WE COMBINE SHIPPING
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