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Dhofar 1285
Basic information Name: Dhofar 1285
     This is an OFFICIAL meteorite name.
Abbreviation: Dho 1285
Observed fall: No
Year found: 2002
Country: Oman
Mass:help 406 g
Meteoritical Bulletin:  MB 90  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 617 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 3 Feb 2006
Writeup from MB 90:

Dhofar 1285        19°18′15′′N, 54°33′3′′E


Find: 11 December 2002

Achondrite (ureilite)

History: Three dark brown stones, broken into fragments of total weight 406 g, were found on 11 December 2002 in the desert of Oman. The fragments were separated by ~2.5 km.

Petrography: (Lorenz, Vernad; Brandstätter, NHMV) A coarse-grained rock that consists mainly of olivine with minor amounts of pyroxene. The veins of troilite and Fe,Ni metal crosscut the whole rock. Accessory phases, graphite, and daubreelite are present.

Geochemistry: The cores of olivine grains (Fo76.6; Fe/Mn = 59) are surrounded by reduction rims (~50 µm in width), which contain small Fe-rich metal grains. The composition of olivine within the reduction rims gradually changes from Fo78; Fe/Mn = 51 on the inside towards Fo96; Fe/Mn = 8.6 at the outer edge. The outer parts of the olivine grain rims are completely replaced by a fine-grained aggregate of olivine (Fo97–99), troilite, and metal. Reduction zones are developed along cracks and veins that cross-cut olivine grains. Pyroxene (En78.7Wo9.8; Fe/Mn = 20) contains numerous, tiny, co-oriented inclusions of Ca-rich pyroxene (En56.2Wo37.3; Fe/Mn = 13), SiO2-rich feldspathic (Ab50An48.5) glass, low-Ni Fe,Ni metal grains, and extremely fine, poorly resolvable exsolution lamellae of Ca pyroxene. In places, pyroxene grains also have reduction rims with composition En83Wo6.7. Cr2O3 contents of olivine and pyroxene (0.7 and 1.1 wt% respectively) and CaO content of olivine = 0.4 wt% are in the ranges of those established for ureilites.

Classification: Achondrite (ureilite); moderate shock, extensive weathering.

Specimens: A 92.48 g type specimen and one thin section are on deposit at Vernad. An anonymous finder holds the main mass.

Data from:
  Table 5
  Line 8:
Mass (g):406
Ferrosilite (mol%):92.48
   and collections
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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     Recommended::   (19° 18' 9"N, 54° 33' 18"E)

     This is 1 of 2168 approved meteorites from Zufar, Oman (plus 22 unapproved names)
     This is 1 of 4002 approved meteorites from Oman (plus 434 unapproved names)
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