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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 79 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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| References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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| Photos: |
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| Geography: |
Statistics: This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) | ||||||||||||||||||||||||||||||