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Jiddat al Harasis 845
Basic information Name: Jiddat al Harasis 845
     This is an OFFICIAL meteorite name.
Abbreviation: JaH 845
Observed fall: No
Year found: 2004
Country: Oman
Mass:help 119.1 g
Meteoritical Bulletin:  MB 103  (2014)  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 21 May 2014
Writeup from MB 103:

Jiddat al Harasis 845 (JaH 845)        19° 59.178’ N, 56° 25.279’ E

Al Wusta, Oman

Found: 2004

Classification: Mesosiderite (group C2)

History: Three rusty pieces, totaling 119.1 g were found by John Blennert in Oman in 2004.

Physical characteristics: The stone is dark and weathered with patches of caliche. A few large, green pyroxene crystals visible on the surface. Fusion crust is absent. Sawn surface shows scattered large pyroxene crystals (to 4 mm) and one 10 mm × 4 mm shard of olivine. Metal (before weathering) and troilite ~20% of rock.

Petrography: Thin section shows cataclastic texture with silicates dominated by pyroxene (~90%) and ~10% Ca-plagioclase. Poikilitic minerals and textures absent. Moderate recrystallization at pyroxene grain margins. Section contains the same olivine shard as the polished hand specimen, which is enclosed by a reaction rim dominated by pyroxene. Metal is heavily weathered (80 to 100%) and troilite less so.

Geochemistry: (Y. Osawa, D. Dunlap, J. Connell, and L. Garvie, ASU) EMPA. Low Ca-pyroxene Fs29.5±1.3Wo2.8±0.6, FeO/MnO = 30.61, n=11; diopside, Fs13.9Wo43.7, FeO/MnO = 21.67, n=1; olivine shard Fa35.6±0.25, FeO/MnO = 54.31, n=2; and plagioclase Or0.36±0.19Ab9.0±2.9, An91±3.0, n= 5. Oxygen isotope replicate analyses (R. Tanaka, OkaU) of acid washed, bulk sample by laser fluorination gave δ17O = 1.938 and 1.929, δ18O = 4.077 and 4.045, and Δ17O = -0.208 and -0.201.

Classification: Textures and mineralogy suggest C mesosiderite (dominated by low-Ca pyroxene) of textural type 2. Likely paired with JaH 203.

Specimens: 43.2 g and one polished thin section at ASU.

Data from:
  Table 0
  Line 0:
State/Prov/County:Al Wusta
Place of purchase:Denver
Latitude:19° 59.178' N
Longitude:56° 25.279' E
Mass (g):119.1
Shock stage:low
Weathering grade:high
Ferrosilite (mol%):29.5±1.3
Wollastonite (mol%):2.8±0.6
Classifier:Y. Osawa, D. Dunlap, J. Connell, and L. Garvie, ASU
Type spec mass (g):43.2
Type spec location:ASU
Main mass:John Blennert
Finder:John Blennert
Comments:Submitted by L. Garvie
Plots: O isotopes:  
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     Recommended::   (19° 59' 11"N, 56° 25' 17"E)

     This is 1 of 1780 approved meteorites from Al Wusta, Oman (plus 81 unapproved names)
     This is 1 of 4524 approved meteorites from Oman (plus 421 unapproved names)
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