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Northwest Africa 14914 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 14914 This is an OFFICIAL meteorite name. Abbreviation: NWA 14914 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 1150 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 82 approved meteorites classified as CK3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 20 Jun 2022 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 14914 (NWA 14914) (Northwest Africa) Purchased: Feb 2020 Classification: Carbonaceous chondrite (CK3) History: One piece with total weight of 1150 g was purchased by V.N. Kalachev from Moroccan meteorite dealer at the Tucson show in February 2020. Physical characteristics: The interior of the meteorite is brownish with gray shade, whereas surface is dark brown. Petrography: (K.A. Konovalova, FMMR): The meteorite contains 20-25% large chondrules (400-1000 µm) in abudant (75-80%) olivine-rich matrix. Some PO chondrules display unequilibrated olivine crystals. The matrix is composed of small olivine crystals with a subordinate quantity high-Ca pyroxene and plagioclase/glass. The main feature of the meteorite is the absence of Fe-Ni metal and troilite (none found in one in thin section). Cr-rich (2.8-3.5 wt.% of Cr2O3) magnetite grains and aggregates are abundant. High oxidation state of the meteorite is also reflected in Fe-rich olivine in the matix (Fa34.5). Nnon-equilibrium olivine is present in chondrules and relatively homogeneous olivine compostion in the matrix. Plagioclase/glass compositions is very variable (An19.8-64.5). All these features are very typical for CK3 chondrites. Some plagioclase/glass pockets include small (20-70 ?m) magnetite blebs. An elongated garnet-rich CAI was observed. The CAI consists of Ti-Al-diopside-spinel core and grossular-anorthite exterior and is surrounded by a Wark-Lovering rim. About 80 vol.% of silicates are stained brown (weathearing index WI-4). Olivine has no undulatory extinction (shock stage is S1). Geochemistry: Mineral composition and Geochemistry: WDS analyses (V.Bulatov, IGG UB RAS, K. Konovalova, FMMR). Equilibrated matrix olivine: Fa34.6±0.9, n=13; unequilibrated olivine in chondrules: Fa24.3±12.7 (Fa1.7-26.1, n=12); low-Ca pyroxene: Fs24.2±1.4Wo0.7±0.3(n=4); high-Ca pyroxene: Fs7.9±6.4Wo39.7±11.9(n=26); plagioclase/glass Ab54.8An42.2Or1.6 (Ab0.5-8.6An19.2-99.5Or0-3.1N=30). Magnetite (N=7) contain Al2O3 - 2.2-3.2 wt.%, Cr2O3 -2.8 -3.5 wt.%, TiO2 - 0.5-1.0 wt.% respectivetlly. Classification: (K.A. Konovalova, FMMR). Carbonaceous chondrite CK3, wi-4, S1 Specimens: V.N. Kalachev holds main mass. 79.88 g and thin section - FMMR. Writeup from MB 111: Northwest Africa 14914 (NWA 14914) (Northwest Africa) Purchased: Feb 2020 Classification: Carbonaceous chondrite (CK3) History: One piece with total weight of 1150 g was purchased by V.N. Kalachev from Moroccan meteorite dealer at the Tucson show in February 2020. Physical characteristics: The interior of the meteorite is brownish with gray shade, whereas surface is dark brown. Petrography: (K.A. Konovalova, FMMR): The meteorite contains 20-25% large chondrules (400-1000 µm) in abudant (75-80%) olivine-rich matrix. Some PO chondrules display unequilibrated olivine crystals. The matrix is composed of small olivine crystals with a subordinate quantity high-Ca pyroxene and plagioclase/glass. The main feature of the meteorite is the absence of Fe-Ni metal and troilite (none found in one in thin section). Cr-rich (2.8-3.5 wt.% of Cr2O3) magnetite grains and aggregates are abundant. High oxidation state of the meteorite is also reflected in Fe-rich olivine in the matix (Fa34.5). Nnon-equilibrium olivine is present in chondrules and relatively homogeneous olivine compostion in the matrix. Plagioclase/glass compositions is very variable (An19.8-64.5). All these features are very typical for CK3 chondrites. Some plagioclase/glass pockets include small (20-70 ?m) magnetite blebs. An elongated garnet-rich CAI was observed. The CAI consists of Ti-Al-diopside-spinel core and grossular-anorthite exterior and is surrounded by a Wark-Lovering rim. About 80 vol.% of silicates are stained brown (weathearing index WI-4). Olivine has no undulatory extinction (shock stage is S1). Geochemistry: Mineral composition and Geochemistry: WDS analyses (V.Bulatov, IGG UB RAS, K. Konovalova, FMMR). Equilibrated matrix olivine: Fa34.6±0.9, n=13; unequilibrated olivine in chondrules: Fa24.3±12.7 (Fa1.7-26.1, n=12); low-Ca pyroxene: Fs24.2±1.4Wo0.7±0.3(n=4); high-Ca pyroxene: Fs7.9±6.4Wo39.7±11.9(n=26); plagioclase/glass Ab54.8An42.2Or1.6 (Ab0.5-8.6An19.2-99.5Or0-3.1N=30). Magnetite (N=7) contain Al2O3 - 2.2-3.2 wt.%, Cr2O3 -2.8 -3.5 wt.%, TiO2 - 0.5-1.0 wt.% respectivetlly. Classification: (K.A. Konovalova, FMMR). Carbonaceous chondrite CK3, wi-4, S1 Specimens: V.N. Kalachev holds main mass. 79.88 g and thin section - FMMR. | ||||||||||||||||||||||||||||||
Data from: MB111 Table 0 Line 0: |
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Institutions and collections |
IGG: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China (institutional address; updated 16 Oct 2011) FMMR: Fersman Mineralogical Museum, Leninskiy prospekt 18 korpus 2, Moscow, Russia, 119071, Russia; Website (institutional address; updated 24 Feb 2018) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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