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Northwest Africa 4895 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 4895 This is an OFFICIAL meteorite name. Abbreviation: NWA 4895 Observed fall: No Year found: 2007 Country: (Northwest Africa) Mass: 305 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 185 approved meteorites classified as CR2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 11 Dec 2021 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 4895 (NWA 4895) (Northwest Africa) Purchased: 2007 Classification: Carbonaceous chondrite (CR2) History: The meteorite was purchased from a local meteorite dealer in Erfoud, Morocco. Physical characteristics: Dark brownish rock without fusion crust. Petrography: Carbonaceous chondrite composed of abundant large, dominantly porphyritic type I chondrules (apparent mean diameter about 700 µm) set into a fine-grained iron-rich matrix. Few type II chondrules, Fe-rich olivine mineral fragments, and CAIs are present. Type I chondrules often show characteristic metal rims and contain abundant metal blebs. Opaque phases in Type II chondrules are mostly sulfides. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates. Geochemistry: olivine in type I chondrules: Fa2.2±0.2 (Fa1.7-2.4, Cr2O3: 0.66±0.14 wt%, n=17; low-Ca pyroxene: Fs2.1±0.9Wo1.3±1.1 (Fs1.4-4.4Wo0.4-4.2, n=18); olivine in type II chondrules: Fa33.2±9.7 (Fa23.4-54.5, n=15); low-Ca pyroxene: Fs26.4±2.5Wo2.5±0.7 (Fs23.6-30.6Wo1.9-4.5, n=10). Matrix analyses yield an average total of 82.8±2.7 wt% (5 µm defocused beam, N=7) suggesting the presence of hydrous minerals. | ||||||||||||||||||||||||||||||
Data from: MB110 Table 0 Line 0: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos: |
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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