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Jiddat al Harasis 203
Basic information Name: Jiddat al Harasis 203
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 203
Observed fall: No
Year found: 2002
Country: Oman
Mass:help 46.2 kg
Meteoritical Bulletin:  MB 93  (2008)  Mesosiderite-C2
Recommended:  Mesosiderite-C2    [explanation]

This is 1 of 5 approved meteorites classified as Mesosiderite-C2.   [show all]
Search for other: Class C mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 14 Jan 2008
Revised 4 Aug 2008: final writeup
Writeup from MB 93:

Jiddat al Harasis 203                       19°58.980'N, 56°24.821'E


Find: 25 December 2002

Mesosiderite (2C)

History: Thirty-one specimens (total mass >46.2 kg) belonging to the same fall event were recovered in 2003-2005 in adjacent areas of JaH and RaS.

Physical characteristics: We describe the best-characterized specimen of this group, 1231.2 g, found by A. Al-Kathiri, M. Eggimann, and S. Lorenzetti. Strongly weathered surface; partial disintegration. Large pyroxene clasts are visible on surface.

Petrography: (E. Gnos, MHNGE; B. Hofmann, NMBE; A. Al-Kathiri, UBE/MCI) The stone has a brecciated texture with a recrystallized matrix. Poikilitic minerals are absent. Point counting in reflected light (n = 500) yielded in vol%, orthopyroxene (some large clasts exceed 5 cm in size) = 68.8, plagioclase (+ silica + phosphate) = 7.8, metal/oxide = 17.2, troilite = 4.6, and isolated, up to 6.5 mm-sized olivine clasts = 1.6. Many orthopyroxene crystals contain abundant sulfide and metallic inclusions along healed cracks. Metal is heavily weathered (80-100%), troilite shows partial oxidation.

Mineral composition and Geochemistry: Microprobe analyses of pyroxene yielded a compositional range of Fs31.0-33.3Wo1.8-40 (average Fs28.4Wo2.5). Bulk composition: After subtraction of metal-derived Fe from bulk analyses and assuming a Fe/Mn ratio of the non-metal fraction of 30, a diogenitic composition with SiO2 = 51.0, Al2O3 = 3.9, MgO = 21.5, CaO = 3.6, and Na2O = 0.23 (all wt%; (REE ~ 2 × CI). Normative plagioclase in silicate fraction is <12 wt%. Estimated primary metal content is 23.5 wt%. Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ17O = 1.403, δ18O = 3.143, and Δ17O = -0.232 (mean of 2 analyses).

Classification: Mesosiderite (2C); minimal shock, extensive weathering. Classification as 2C mesosiderite is based on low plagioclase content and recrystallized matrix without poikilitic minerals.

Specimens: Type specimen and main mass at NMBE.

Submitted by: Beda Hofmann, NMBE.

Data from:
  Table 8
  Line 46:
Origin or pseudonym:Oman, desert plain
Mass (g):1231.2
Shock stage:S1
Type spec mass (g):1231.2
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)
UBE: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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     Recommended::   (19° 58' 59"N, 56° 24' 49"E)

     This is 1 of 1780 approved meteorites from Al Wusta, Oman (plus 81 unapproved names)
     This is 1 of 4522 approved meteorites from Oman (plus 422 unapproved names)
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