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Northwest Africa 1709 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 1709 This is an OFFICIAL meteorite name. Abbreviation: NWA 1709 Observed fall: No Year found: 2002 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 78 approved meteorites classified as H3.8. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
Comments: | Approved 8 Sep 2008 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 94:
Northwest Africa 1709 Northwest Africa Find: March 2002 Ordinary chondrite (H3.8) History: A small stone was bought at an Erfoud market by an anonymous buyer. Physical characteristics: A single dark brown piece of 9 g with fusion crust traces. Petrography: (V. Moggi Cecchi, G. Pratesi, MSP) The overall texture consists of chondrules 250–550 μm in size, of different types (PO, POP, BO, RP) and their fragments embedded in a fine-grained matrix; matrix silicates are mainly olivine and orthopyroxene, with minor clinopyroxene; some olivine grains in BO and PO chondrules are zoned and contain a glassy mesostasis. Opaque phases are kamacite and troilite. Geochemistry: Olivine Fa1.2–21.2, mean Fa15.4 (P.M.D.Fa 47.5); low-Ca pyroxene (Fs4.8–16.9En95.0–82.4Wo0.2–0.8, mean Fs11.6 En86.1Wo1.5 P.M.D.Fs 38.70); diopside Fs11.7En51.0Wo37.2. Oxygen isotopes (R. Greenwood, I. Franchi, OU) δ18O = 4.448‰; δ17O = 2.840‰;; Δ17O = 0.527‰. Classification: Ordinary chondrite (H3.8); S2; W3. Type specimens: A total of 1.7 g, one polished thin section and a block are on deposit at MSP. An anonymous collector holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB94 Table 2 Line 1: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022) OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos: |
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |