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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
Meteoritical Bulletin:  MB 110  (2022)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 85 approved meteorites (plus 1 unapproved name) 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     Recommended::   (19° 0' 37"N, 53° 18' 33"E)

     This is 1 of 2169 approved meteorites from Zufar, Oman (plus 24 unapproved names)
     This is 1 of 4006 approved meteorites from Oman (plus 436 unapproved names)
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