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Ramlat Fasad 531
Basic information Name: Ramlat Fasad 531
     This is an OFFICIAL meteorite name.
Abbreviation: RF 531
Observed fall: No
Year found: 2018
Country: Oman
Mass:help 42.3 g
Recommended:  Winonaite    [explanation]

This is 1 of 74 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 30 Aug 2021
Writeup from MB 110:

Ramlat Fasad 531        19°00.617’N, 53°18.553’E

Zufar, Oman

Find: 2018 Jan 23

Classification: Primitive achondrite (Winonaite)

History: A single fragment was found during a search for meteorites.

Physical characteristics: Dark brown, almost black irregular fragment, 3 × 3 × 2 cm, wind-ablated with protruding veins of Fe-(hydr)oxides, attached sand cemented with Fe-(hydr)oxides.

Petrography: (Åke Rosén, E. Gnos, B. Hofmann) The sample consists of forsterite, enstatite, diopside, albite and almost completely oxidized iron metal (~30 vol%), with minor chromite, troilite and graphite. Equigranular silicate grains with triple junctions, typical size is 50-150 μm. Unshocked (S1). Almost complete weathering of metal, silicates are unaffected.

Geochemistry: (Å. Rosén) Olivine Fa1.51±0.26, molar FeO/MnO 2.8±1.0 (N = 14), enstatite Fs1.57±0.64 (N = 8 ), diopside Fs1.00±0.26Wo48.2±1.7 (N = 23), albite An5.2Or3.7 (n=3). Oxygen isotopes: (R. Greenwood, OU) δ18O = 5.506 δ17O = 2.400 Δ17O = -0.463 (all ‰, sample EATG-cleaned).

Classification: Winonaite based on mineral composition, mode and oxygen isotopes, unshocked, strongly weathered.

Specimens: 8.46 g and one polished thin section at NMBE. Main mass: MHTO.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Desert plain
Date:2018 Jan 23
Mass (g):42.251
Shock stage:low
Weathering grade:high
Fayalite (mol%):1.51±0.26 (n=14)
Ferrosilite (mol%):1.57±0.64 (n=8)
Wollastonite (mol%):1.75±0.20 (n=8)
Magnetic suscept.:5.04
Classifier:Å. Rosén, E. Gnos, B. Hofmann
Type spec mass (g):8.46
Type spec location:NMBE
Main mass:MHTO
Finder:U. Eggenberger, M. Fisch, A. Glauser, G. Weibel, M. Wolffers, W. Zucha, S. Al-Hamemi
Comments:Field number 1801_0074; submitted by Beda Hofmann
Plots: O isotopes:  
   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)
MHTO: Ministry of Heritage and Tourism Muscat , Oman (institutional address; updated 10 Apr 2021)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     Recommended::   (19° 0' 37"N, 53° 18' 33"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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