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Jiddat al Harasis 1100
Basic information Name: Jiddat al Harasis 1100
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 1100
Observed fall: No
Year found: 2015
Country: Oman
Mass:help 365 g
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 514 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 8 Jan 2018
Writeuphelp
Writeup from MB 107:

Jiddat al Harasis 1100 (JaH 1100)        19°42.31’N, 56°35.64’E

Al Wusta, Oman

Find: 15 Feb 2015

Classification: Ureilite

Physical characteristics: A 365 g sample supplied by the Sultan Qaboos University, which has a millimeter thick, dark brown-grey fusion crust present on all faces except one cut face. This fusion crust lacks remaglypts instead has a mainly rough surface. There are no contraction cracks present on this sample. This rock has already been cut and there is a clean face already present. Elongated grey laths can be identified on the cut face, with most less than 0.5 cm wide. The sample is also magnetic.

Petrography (P. Hill, UWO) The sample is composed of elongated, round grains of olivine and pyroxene that are ~1-2 mm wide and occasionally meet at 120° angles. Olivine (~60 vol%) is more modally abundant than pyroxene (30 vol %). The sample is fairly porous with large gaps between pyroxene and olivine grains; however, there is a lack of porosity between grains of the same mineralogy. Instead, iron oxides are present and have filled in most of the fractures. Within some of the larger pores, graphite is observed. The graphite is associated with the olivine grains, with only a few occurrences near the pyroxene. Pyroxene is often associated with small porous inclusions throughout the grains, often running perpendicular to the elongated nature of the grain and a plane of cleavage. These inclusions are often filled with iron oxides. The reduction rims observed in olivine grains are <50 μm thick fitting within the R2 grade put forward by Wittke et al. (2007). Very little kamacite or taenite are present, most are occurring as small inclusions. Most of the metal has oxidized, (>95%). Overall there is little evidence of the silicate phases weathering and no weathering phase was identified in abundance. Overall, this meteorite has experienced moderate terrestrial weathering with most of the Fe-Ni metal being oxides but no evidence of alteration in the silicates phases. The olivine within these samples does show undulose extinction and the mosaic texture of the olivines suggesting this sample has been highly shocked.

Geochemistry: Mineral composition and geochemistry (M. Beauchamp, P. Hill, UWO) Olivine (Fa23.9±1.5), low-Ca pyroxene (Fs15.5±2.8Wo7.9±2.9)

Classification: Classificaiton: Ureilite, S5, W3.

Specimens: 365 g type specimen, including polished thin section, are on deposit at SQU.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Date:15 Feb 2015
Latitude:19°42.31'N
Longitude:56°35.64'E
Mass (g):365
Pieces:2
Class:Ureilite
Fayalite (mol%):21.8±2.0 (N=28)
Ferrosilite (mol%):15.5±2.8 (N=27)
Wollastonite (mol%):8.0±2.9
Classifier:P. Hill, N. Banerjee, G. Osinski, UWO; S. Nasir, SQU
Type spec mass (g):365
Type spec location:SQU
Main mass:SQU
Comments:Submitted by P. Hill
Institutions
   and collections
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
SQU: Sultan Qaboos University, College of Science, Earth Sciences Department, P.O. Box 36 Code 123 Al­Khoud, Oman (institutional address; updated 5 Oct 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Geography:

Oman
Coordinates:
     Recommended::   (19° 42' 19"N, 56° 35' 38"E)

Statistics:
     This is 1 of 1747 approved meteorites from Al Wusta, Oman (plus 72 unapproved names)
     This is 1 of 3944 approved meteorites from Oman (plus 371 unapproved names)
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