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Jiddat al Harasis 556
Basic information Name: Jiddat al Harasis 556
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 556
Observed fall: No
Year found: 2008
Country: Oman
Mass:help 36.6 g
Meteoritical Bulletin:  MB 100  (2012)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 395 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 26 Sep 2011
Writeup from MB 100:

Jiddat al Harasis 556 (JaH 556)        19°39.429’N, 55°35.392’E

Al Wusta, Oman

Found: 24 Jan 2008

Classification: HED achondrite (Howardite)

History: A single stone was found during a search for meteorites by E. Gnos, E. Janots, B. Hofmann, and A. Grimberg.

Physical characteristics: Irregular brown 36.647 g stone without fusion crust. Large vesicles (3-5 mm) are visible on the surface and in tomographic sections.

Petrography: (E. Janots, Münster; V. Nentwig, Münster, E. Gnos, MHNGE; B. Hofmann, NMBE): Petrographically heterogeneous rock consisting of lithic and mineral clasts in a finely recrystallized matrix. The matrix consists of clinopyroxene (Fs30-42Wo6-15) and plagioclase (An76-92). Single mineral clasts of Opx (Fs24-32Wo2-3), Cpx (Fs32-39Wo5-15), olivine (Fa19-44) and plagioclase (An76-92) to 0.8 mm. Plagioclase clasts often recrystallized (probably from maskelynite) containing small troilite and ilmenite/spinel inclusions. Two types of rock clasts are distinguished: (1) Clasts consisting of opx (Fs25-32Wo2-3) and olivine (Fa37-41); (2) clasts consisting of opx (Fs20Wo2), olivine (Fa20-50), plagioclase (An61-66). In the rock clasts, olivine can have a mosaic texture. Clasts show different ° of shock (maximum stage 5 with plagioclase recrystallization). Matrix contains remnants of chondrules with Fa20-23 in center. Although metal is fully weathered to magnetite, hematite and goethite, the shape of oxides indicates former iron melt droplets. Pores are partially filled with secondary anhydrite and celestite and probable clay minerals.

Geochemistry: Bulk chemistry by combined ICP/ICP-MS shows CaO 6.9 wt%, MgO 14.1 wt%, Fe/Mn = 42.5 g/g, Ni 3940 ppm, Co 160 ppm. Oxygen isotopes (I.A. Franchi and R.C. Greenwood, OU): Analyses of thoroughly cleaned pyroxene clast (n=2) and matrix (n=9) yielded, respectively, δ17O = 1.88, 2.48, δ18O = 4.02, 4.98, and Δ17O = -0.23, -0.13 (linearized values).

Classification: Based on mineral chemistry, oxygen isotopes and texture, this is an HED impact melt breccia containing diogenitic and eucritic clasts in roughly equal abundance, consistent with a Howardite classification. Oxygen isotope data of matrix and high Ni abundance indicate admixture of ~10-15% ordinary chondrite (most likely H).

Specimens: All at NMBE.

Data from:
  Table 1
  Line 518:
State/Prov/County:Al Wusta
Origin or pseudonym:Desert plain
Date:24 Jan 2008
Mass (g):36.6
Classifier:E. Gnos and B. Hofmann
Type spec mass (g):36.6
Type spec location:NMBE
Main mass:NMBE
Finder:E. Gnos, B. Hofmann, A. Grimberg, E. Janots
Comments:Submitted by Beda Hofmann
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. 100, MAPS 49, E1-E101 (2014)
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     Recommended::   (19° 39' 26"N, 55° 35' 24"E)

     This is 1 of 1753 approved meteorites from Al Wusta, Oman (plus 75 unapproved names)
     This is 1 of 3984 approved meteorites from Oman (plus 374 unapproved names)
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