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Sayh al Uhaymir 169
Basic information Name: Sayh al Uhaymir 169
     This is an OFFICIAL meteorite name.
Abbreviation: SaU 169
Observed fall: No
Year found: 2002
Country: Oman
Mass:help 206 g
Classification
  history:
Meteoritical Bulletin:  MB 87  (2003)  Lunar (KREEP-rich mafic impact melt breccia)
MetBase:  v. 7.1  (2006)  Lunar (anorth)
Recommended:  Lunar    [explanation]

This is 1 of 88 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Revised 29 Jun 2017: Removing term "-anorth" from class. Was not correct
Writeuphelp
Writeup from MB 87:

Sayh al Uhaymir 169

Oman

Found 2002 January 16

Lunar meteorite (KREEP-rich mafic impact melt breccia and adhering regolith)

A complete, light grey-greenish rounded stone (70 × 43 × 40 mm) weighing 206.45 g was found in the Sayh al Uhaymir region of Oman. Finders, mineralogy and classification: E. Gnos, B. A. Hofmann, and A. Al-Kathiri (UniBern): dark brown fusion crust is only locally preserved. The impact melt breccia (87 vol% of the stone, based on 8 X-ray tomographic sections) contains 25–40 vol% of strongly shocked igneous rocks and crystal clasts (up to 17 mm) derived from norites, evolved magmatites, and granulites set in a fine-grained (<0.1 mm) crystalline matrix. Most crystal fragments are shocked plagioclases, locally associated with enstatite. In addition to plagioclase metallic iron, spinel, olivine, and orthopyroxene clasts are present. The fine-grained impact melt matrix consists mainly of short prismatic low-Ca pyroxene (En61–64, Wo2–4), interstitial plagioclase (An75–81) intergrown with potassium feldspar. The remaining minerals are poikilitic ilmenite, whitlockite, olivine (Fo58–59), zircon, and traces of troilite, kamacite and tridymite. The regolith (13 vol%) present one one side of the meteorite comprises crystalline and glassy volcanic rocks, igneous lithic fragments, breccia fragments, fragments of mafic granulites, and crystal fragments. The impact melt breccia contains 32 ppm Th and 8.5 ppm U, 0.47% K (K/U = 553), indicating a lunar origin.This is further confirmed by fusion-crust Fe/Mn of 75.1 (microprobe, n = 14) and impact melt bulk Fe/Mn of 79. Oxygen isotope composition (I. A. Franchi, OU) are also consistent with a lunar origin (∆17O = 0.001 ± 0.032‰). This impact melt breccia is the most strongly KREEP-eriched lithology among all known lunar rocks. Weathering: W1 (Fe metal shows only little oxidation). Specimens: All in NMB.

Data from:
  MB87
  Table 4
  Line 339:
Date:16 Jan 2002
Latitude:20°34.391'N
Longitude:57°19.4'E
Mass (g):206.454
Pieces:1
Class:Lunar
Classifier:E. Gnos, B. Hofmann and A. Al-Kathiri, NMB
Institutions
   and collections
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)
NMB: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Beda Hofmann   
Randy Korotev   
Geography:

Oman
Coordinates:
     Recommended::   (20° 34' 23"N, 57° 19' 24"E)

Statistics:
     This is 1 of 1749 approved meteorites from Al Wusta, Oman (plus 72 unapproved names)
     This is 1 of 3951 approved meteorites from Oman (plus 371 unapproved names)
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