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Northwest Africa 1709
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:help 9 g
Meteoritical Bulletin:  MB 94  (2008)  H3.8
Recommended:  H3.8    [explanation]

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 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:
  Table 2
  Line 1:
State/Prov/County:Northwest Africa
Mass (g):9
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):1.2-21.2
Ferrosilite (mol%):4.8-16.9
Wollastonite (mol%):0.2-0.8
Classifier:V. Moggi Cecchi, G. Pratesi, Museo di Scienze Planetarie
Type spec mass (g):1.7
Type spec location:MSP
Main mass:anonymous
Comments:δ18O = 2.840‰; δ17O = 4.448‰;Δ17O = 0.527‰.
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos from the Encyclopedia of Meteorites:
Meteorites Australia   

     This is 1 of 9743 approved meteorites from (Northwest Africa) (plus 1857 unapproved names)

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