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Jiddat al Harasis 938
Basic information Name: Jiddat al Harasis 938
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 938
Observed fall: No
Year found: 2013
Country: Oman
Mass:help 1477 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  R4-5
Recommended:  R4-5    [explanation]

This is 1 of 3 approved meteorites classified as R4-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 26 Dec 2015
Writeuphelp
Writeup from MB 104:

Jiddat al Harasis 938 (JaH 938)        19°44.950’N, 55°51.419’E

Al Wusta, Oman

Find: 28 Jan 2013

Classification: Rumuruti chondrite (R4-5)

History: Found by Edwin Gnos, Beda Hofmann, Urs Eggenberger, Thomas Burri, Pete Stephenson and Mohammed Al Battashi during a search for meteorites on January 28, 2013.

Physical characteristics: 54 dark brown, wind-ablated fragments ranging from 246 g to less than one gram, total mass 1477 g. Found close together, they probably represent a single, strongly weathered individual. No fusion crust preserved.

Petrography: (B. Hofmann, NMBE and E. Gnos, MHNGE) The meteorite is a breccia. Mean apparent chondrule size is 0.51±0.26 mm (n=163), maximum size 0.9 mm. Bimodal feldspar grain size <5 μm and 20-30 μm. Iron sulfides are largely oxidized.

Geochemistry: (N. Greber, Bern) Mineral compositions: olivines are Fa38.4±0.8 (Fa36.7-39.4, n=15). Average olivine composition by XRD is Fa38.0±1.0 (n=3). Average low-Ca pyroxene is Fs8.6Wo0.6 (Fs4.6-14.3Wo0.3-1.2, n=5), average high-Ca pyroxene is Fs12.2Wo43.2 (Fs10.8-16.2Wo29.2-52.7, n=4). Feldspar compositions are An11.3Or2.2 (An4.6-14.3Or1.9-2.4, n=4). Oxygen isotopes (R. Greenwood, OU): δ18O=7.43, δ17O=6.07, Δ17O=2.21 (sample leached with ethanolamine thioglycollate to remove Fe-hydroxides).

Classification: Based on mineral compositions, oxygen isotopes and plagioclase grain size this is a brecciated Rumuruti chondrite with petrographic grades 4 and 5. Shock grade ranges from S1 to S3 in different clasts. Strongly weathered.

Specimens: All at NMBE

Data from:
  MB104
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Origin or pseudonym:Desert plain
Date:28 Jan 2013
Latitude:19°44.950'N
Longitude:55°51.419'E
Mass (g):1477
Pieces:54
Class:R4-5
Shock stage:low
Fayalite (mol%):38.4±0.8 (N=15)
Ferrosilite (mol%):8.6±5.0 (N=5)
Wollastonite (mol%):0.6±0.4 (N=5)
Classifier:B. Hofmann, N. Greber, E. Gnos
Type spec mass (g):1477
Type spec location:NMBE
Main mass:NMBE
Finder:Mohammed Al-Battashi, Thomas Burri, Urs Eggenberger, Edwin Gnos, Beda Hofmann, Pete Stephenson
Comments:Submitted by Beda Hofmann
Plots: O isotopes:  
Institutions
   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)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography:

Oman
Coordinates:
     Recommended::   (19° 44' 57"N, 55° 51' 25"E)

Statistics:
     This is 1 of 1751 approved meteorites from Al Wusta, Oman (plus 67 unapproved names)
     This is 1 of 3947 approved meteorites from Oman (plus 366 unapproved names)
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