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Ramlat Fasad 057
Basic information Name: Ramlat Fasad 057
     This is an OFFICIAL meteorite name.
Abbreviation: RF 057
Observed fall: No
Year found: 2016
Country: Oman
Mass:help 13.1 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 19 Apr 2018
Writeup from MB 107:

Ramlat Fasad 057        19°0.580’N, 53°20.587’E

Zufar, Oman

Find: 31.01.16

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Pale/greyish brown to greenish brown, platy fragment, 3x4x0.7 cm, without fusion crust. Wind-ablation on small sides.

Petrography: (Felix Mechelke, Bern, B. Hofmann, NMBE) The meteorite consists of pigeonite and augite (together 48 vol%, typical length 0.5-1 mm), olivine (35 vol.%, typical size 0.6 mm) and plagioclase completely transformed to maskelynite (11 vol.%, typical size 0.3x0.7 mm). Accessories (6 vol%) comprise pyrrhotite and spinel. Weathering effects: Minor replacement of silicates by terrestrial calcite along fractures, staining of silicates with iron hydroxides near surface.

Geochemistry: (Felix Mechelke, Bern, B. Hofmann, NMBE) Olivine rim compositions are Fa 40.8±3.5 (N = 43). Dark brown, partially altered cores are Fa 35.1±1.9 (N = 21). Pigeonite compositions are Fs 29.8±3.1 (N = 44, range 27.3-43.4), Wo8.8±1.7 (range 6.3-13.6), mean FeO/MnO = 28.0±1.4; augite compositions are Fs 23.1±2.8 (range 20.1-29.2, N = 8) Wo31.0±5.3 (range 20.3-36.4). Maskelynite has An 53.0±1.5 (range 48.5-55.7) Or1.7±0.4 (range 1.2-2.8, N = 29). Bulk Fe/Mn (XRF) is 35.5±2.7 (N = 5). Oxygen isotopes (R. Greenwood, OU): δ17O 3.031, δ18O 5.257, Δ17O 0.297.

Classification: Based on petrography, mineral compositions, bulk Fe/Mn and oxygen isotopes this is a strongly shocked shergottite.

Specimens: All at NMBE

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Desert plain
Mass (g):13.049
Class:Martian (shergottite)
Shock stage:strong
Weathering grade:low
Fayalite (mol%):40.8±3.5 (N = 43)
Ferrosilite (mol%):29.8±3.1 (N = 44); 23.1±2.8 (N = 8)
Wollastonite (mol%):12.1±8.1 (N = 47); 31.0±5.3 (N = 8)
Classifier:F. Mechelke, B. Hofmann
Type spec mass (g):13.049
Type spec location:NMBE
Main mass:NMBE
Finder:Edwin Gnos, Beda Hofmann, Zaid Al-Musharrafi, Åke Rosén
Comments:Field number 1601_0094; 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)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     Recommended::   (19° 0' 35"N, 53° 20' 35"E)

     This is 1 of 2531 approved meteorites from Zufar, Oman (plus 27 unapproved names)
     This is 1 of 4404 approved meteorites from Oman (plus 434 unapproved names)
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