Description: Hi my name is Luisa Stream, im part of Streaming meteorites. Im excited to be here, every meteorite I sell comes with a COA card and display✨ meteorite:NWA 13791 Weight: 14.906 Grams. Basic informationName: Northwest Africa 13791 This is an OFFICIAL meteorite name. Abbreviation: NWA 13791 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass:help 142.6 g Classification history: Meteoritical Bulletin: MB 110 (2022) Achondrite-ung Recommended: Achondrite-ung This is 1 of 160 approved meteorites classified as Achondrite-ung. [show all] Search for other: Achondrites, Ungrouped achondrites Comments:Approved 8 Aug 2021 Writeup from MB 110: Northwest Africa 13791 (NWA 13791) (Northwest Africa) Purchased: 2020 Classification: Ungrouped achondrite Petrography: (K. Metzler, IfP) Equigranular igneous rock with some vesicles. It consists of ~85% mafic components (olivine and low-Ca pyroxene with Ca-rich pyroxene rims) and ~15 vol% fine-grained interstitial material. The typical grain size is ~300-1000 µm. Metal and sulfide beads up to 800 µm are completely oxidized by terrestrial weathering. Geochemistry: Mineral compositions and geochemistry: Olivine grains show igneous chemical zoning, with increasing Fe concentrations from core to rim. Mean olivine composition is Fa20.5±3.2 (Fa16.4-29.5; n=17); Fe/Mn (at.): 50±12. Mean low-Ca pyroxene composition is Fs20.1±0.9Wo2.7±0.3 (Fs18.1-21.4Wo2.2-3.1; n=17); Fe/Mn (at.): 29±10. The mean composition of Ca-rich pyroxene is Fs18.6±2.1Wo28.1±3.9 (Fs15.0-22.3Wo21.7-34.1; n=8); Fe/Mn (at.): 28±7. Mean bulk composition of fine-grained interstitial material (EDX analyses; area ~50x100 µm; wt%): SiO2 64.2; Al2O3 17.1; Na2O 9.4; FeO 4.2; CaO 3.2; MgO 0.5; K2O 0.8; TiO2 0.7. Based on mineral chemistry, this sample has affinities to L or H ordinary chondrites. Classification: Ungrouped achondrite: The combination of mineral compositions does not fit to any known achondrite group, although it exhibits affinities to H or L ordinary chondrites. Data from: MB110 Table 0 Line 0: Place of purchase:Waran, Mauritania Date:P 2020 Mass (g):142.6 Pieces:1 Class:Achondrite-ung Shock stage:M-S1 Weathering grade:high Fayalite (mol%):20.5±3.2 Ferrosilite (mol%):20.1±0.9; 18.6±2.1 Wollastonite (mol%):2.7±0.3; 28.1±3.9 Classifier:K. Metzler, IfP Type spec mass (g):20 Type spec location:IfP Main mass:Mohamed Ali Loud Comments:Submitted by K. Metzler, IfP
Price: 399 USD
Location: Riverside, California
End Time: 2025-01-07T00:32:18.000Z
Shipping Cost: N/A USD
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