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| Northwest Africa 16528 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 16528 This is an OFFICIAL meteorite name. Abbreviation: NWA 16528 Observed fall: No Year found: 2012 Country: Morocco Mass:  328 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 653 approved meteorites (plus 2 unapproved names) classified as CO3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 6 Mar 2024 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 113:
Northwest Africa 16528 (NWA 16528) Morocco Purchased: 2012 Dec Classification: Carbonaceous chondrite (CO3) History: Fabien Kuntz purchased many samples with a combined weight of 328.41 g from a Moroccan dealer in Erfoud in December of 2012. Physical characteristics: Samples are dark brown with smooth exteriors. The cut face shows numerous chondrules set in a dark brown matrix. Petrography: Description and classification (A. Love, App) Sample shows a chondritic texture composed of abundant, well-defined chondrules, minerals grains and CAI’s set within an opaque matrix. Chondrules are coated with fine-grained rims and have an average apparent diameter of 135 µm, n=106. Additional minerals are: pentlandite, chromite and troilite. Geochemistry: (A. Love, App) olivine (Fa18.2±22.3, Fa0.4-72.9), Fe/Mn=47.7±43.2, n=18, Cr2O3 in Fa>2 = 0.3±0.2, n=10); low-Ca pyroxene (Fs1.3±0.7Wo1.5±1.2, Fe/Mn=8.6±3.6 n=10). Oxygen isotopes (D. Ibarra R. Havel, Brown U): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O = -4.774, -5.388; δ18O = -0.520, -1.469 (all per mil and normalized to San Carlos which was analyzed simultaneously). Oxygen isotopes plot in along the CCAM close to the field defined for CO chondrites. Classification: Carbonaceous chondrite (CO3.0, C-S1, W3) Estimated subtype 3.05 based on Cr2O3 in ferroan olivine. Textures, CL signatures, magnetic susceptibility and unequilibrated mineral chemistry also indicate sample is an CO3. Specimens: Fabien Kuntz holds the main masses. A polished thin section and several individuals weighing 23.22 g are on deposit at App. | ||||||||||||||||||||||||||||||||
| Data from: MB113 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||||
| Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) Kuntz: Fabien Kuntz, France; Website (private address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Geography:
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Statistics: This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||