![]() |
||
|
Northwest Africa 6489 | |||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 6489 This is an OFFICIAL meteorite name. Abbreviation: NWA 6489 Observed fall: No Year found: 2010 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 518 approved meteorites classified as Diogenite. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 23 Oct 2012 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 101:
Northwest Africa 6489 (NWA 6489) (Northwest Africa) Purchased: Jun 2010 Classification: HED achondrite (Diogenite) History: A stone was purchased by Giorgio Tomelleri at Sainte Marie, France. Physical characteristics: A 3.2 g angular stone with smooth faces. Surface is brown with dark weathered patches. Petrography: (C. A. Lorenz, Vernad) The meteorite has brecciated texture and consists of 0.5-1.5 mm mineral clasts (80 vol%) embedded in a fine-grained clastic matrix (20 vol%). Pyroxene dominant mineral phase; olivine is minor; accessory phases include feldspar, chromite, troilite, and FeNi metal. Locally, large mineral fragments are joined by fine-grained (10 μm) aggregate of pyroxene and feldspar. Geochemistry: (N. N. Kononkova, Vernad) Pyroxene En75.6-81.9Wo0.4-1.0 (Fe/Mn=25-30); olivine Fo76.7-89.7 (Fe/Mn ranges from 46 to 30); oxygen isotope composition (I. Franchi, R. Greenwood, OU, Laser fluorination): δ17O=1.598, δ18O=3.504, Δ17O=-0.226 (all per mil). Classification: Diogenite Specimens: A total of 2.95 g main mass sample and one thin polished section are on deposit at Vernad. | ||||||||||||||||||||||||||||
Data from: MB101 Table 0 Line 0: |
|
||||||||||||||||||||||||||||
Plots: | O isotopes: | ||||||||||||||||||||||||||||
Institutions and collections |
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) Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016) |
||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
| ||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |