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Jiddat al Harasis 422
Basic information Name: Jiddat al Harasis 422
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 422
Observed fall: No
Year found: 2007
Country: Oman
Mass:help 61.5 g
Meteoritical Bulletin:  MB 95  (2009)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 613 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 9 Jan 2009
Writeup from MB 95:

Jiddat al Harasis 422             19°50.357′N, 56°28.762′E


Find: 3 March 2007

Achondrite (ureilite impact melt breccia with dunite clasts)

History: A single stone was found during a search for meteorites by M. Eggimann, E. Gnos, E. Janots, B. Hofmann, L. Huber and F. Zurfluh.

Physical characteristics: Rounded reddish-brown single stone with a mass of 61.48 g, no fusion crust preserved, wind polished surface. Heterogeneous surface with protruding clasts.

Petrography (E. Janots, IMM E. Gnos, MHNGE; B. Hofmann, NMBE): The rock is a dimict breccia and shows a thorough fine-grained, equigranular recrystallization/reequilibration texture of clasts and matrix. Dunite clasts (~50%) are up to 14 mm long, nearly free of carbon platelets, secondary iron hydroxides and large pores. The dunite clasts consist of nearly pure, homogeneous olivine (Fa19–21) with triple joints. The groundmass, ~50% of the stone, consists of olivine (Fa10–17), orthopyroxene (Fs9–12Wo0.5–5,0) and augite (Fs9–12Wo20–35), abundant carbon platelets (up to 1 mm) consisting of graphite and diamond and Fe-oxyhydroxides. At the contact with pores and carbon/Fe-hydroxides, olivine and pyroxene show a narrow reduction rim depleted in Fe. The groundmass contains numerous pores up to 1 mm in size, partially filled with secondary bassanite (based on Raman spectroscopy). The groundmass is interpreted as ureilite impact melt with residual carbon phases.

Geochemistry: Oxygen isotopes (I. A. Franchi and R. C. Greenwood, OU) of dunite clast δ17O = 2.87, δ18O = 7.57, and Δ17O = −1.07 (mean of two replicates). Oxygen isotopes of matrix: δ17O = 3.31, δ18O = 8.31, and Δ17O = −1.00 (mean of two replicates) (Δ17O= δ17O-0.52 δ18O). Both, clast and matrix analyses plot within the ureilite field.

Classification: Ureilite (impact melt breccia with dunite clasts)
Type specimens: All at NMBE.

Data from:
  Table 7
  Line 40:
State/Prov/County:Al Wusta, Oman
Origin or pseudonym:Desert plain
Mass (g):61.5
Fayalite (mol%):10-17.0
Ferrosilite (mol%):9-12.0
Wollastonite (mol%):0.5-5.0
Classifier:E. Gnos, E. Janots, B. Hofmann
Type spec mass (g):61.5
Type spec location:NMBE
Main mass:NMBE
Finder:M. Eggimann, E. Gnos, E. Janots, B. Hofmann
Comments:Impact melt breccia, dunite clast olivine, Fa19–21
Plots: O isotopes:  
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
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)
MHNGE: Muséum d’histoire naturelle, Route de Malagnou 1, CH-1211 Genève 6 , Switzerland (institutional address; updated 27 Oct 2011)
References: Published in Meteoritical Bulletin, no. 95, MAPS 44, 429-462 (2009)
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     Recommended::   (19° 50' 21"N, 56° 28' 46"E)

     This is 1 of 1756 approved meteorites from Al Wusta, Oman (plus 75 unapproved names)
     This is 1 of 4002 approved meteorites from Oman (plus 434 unapproved names)
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