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| Northwest Africa 14707 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 14707 This is an OFFICIAL meteorite name. Abbreviation: NWA 14707 Observed fall: No Year found: 2012 Country: Morocco Mass:  76.7 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 6459 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||
| Comments: | Approved 26 Mar 2022 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 111:
Northwest Africa 14707 (NWA 14707) Morocco Purchased: 2012 Classification: Ordinary chondrite (H4) History: Sample was purchased at the Tucson mineral show in 2012 from A. Aaronson, who acquired it from Morocco. Sample is catalogued at ROM as M58499. Physical characteristics: Round, disk-shaped weathered individual, possibly oriented. Dome-like main surface is covered in fusion crust and is opposite an irregular fusion crust covered surface. The join between the domal and irregular surfaces has thicker fusion crust that may be a rollover rim. Stone has deep open cracks and mature desert polish. Physical properties: Magnetic susceptibilty of a 56.83 g specimen is log χ (× 10-9 m3/kg) = 4.81. Petrography: A cut face (7 cm2) shows a dark interior bearing metal grains which decorate the boundaries of apparent angular blocks and possible veins. A network of sub-mm thick veins cuts the stone, which also has regions of local Fe oxide weathering. In polished thin section, chondrules, chondrule fragments and individual grains are readily delineated in a recrystallized matrix. Chondrules are of dominantly of POP, PO and RP types, with an average diameter 402±299 µm (n=38). Olivine and pyroxene grains show undulatory to mosiac extinction and commonly have planar fractures. In reflected light, metal occurs as elogate blebs and aggregates which define a foliation in the stone. An Fe oxide vein network is pervasive at a fine µm thick scale up to 300 µm veins. Fe oxides are locally collected in pockets, often associated with relict metal and sulfide grains. Geochemistry: Olivine estimated as Fa19.1, from calibrated powder XRD. Classification: Ordinary chondrite: H4 (S4) W3. Chondrule sizes, metal abundance and powder XRD estimate of olivine composition at Fa19.1 indicates an H chondrite. Slightly low magnetic susceptibility for H chondrite reflects weathering replacement of Fe metal with Fe oxides. Olivine, pyroxene shock features and foliation defined by metal suggests high shock of S4. Specimens: Type specimen ROM; main mass DGregory | ||||||||||||||||||||||||||
| Data from: MB111 Table 0 Line 0: |
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| Institutions and collections |
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011) UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015) Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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| References: | Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:
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Statistics: This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||