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Mederdra
Basic information Name: Mederdra
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2019
Country: Mauritania
Mass:help 1552 g
Classification
  history:
Recommended:  R4-5    [explanation]

This is 1 of 4 approved meteorites classified as R4-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 14 Jan 2020
Writeuphelp
Writeup from MB 109:

Mederdra        16.8539806, -15.9293383

Trarza, Mauritania

Find: 2019 July 17

Classification: Rumuruti chondrite (R4-5)

History: The meteorite was found during a search for meteorites.

Physical characteristics: Complete piece. It has primary fusion crust over 70% of the surface, secondary crust over 20%. The fusion crust is brown dark, thick, well preserved, and has contraction cracks. The rock measures 12 × 9.5 × 7.5 cm. It weighs 1552 g.

Petrography: Breccia containing chondrules and chondrule fragments embedded in a fine-grained yellow-brown matrix. Opaque phases are chromite and FeNi-sulfides. Metallic FeNi has not been found. Low-Ca pyroxene has not been found.

Geochemistry: Olivine, Fa39.2±0.8 (Fa38.1-42.2; n=20) Fe/Mn=82±1.5; pyroxene, Fs11.5±0.9Wo 45.0±1.1 (Fs10.2-12.7Wo43.7-46.6; n=15): Plagioclase: An9.7-11.1 (n=4).

Classification: R4-5, S2, W3

Specimens: 20 g type specimen in UPC; 20 g J. Llorca. The remaining mass in MCM.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Trarza
Date:2019 July 17
Latitude:16.8539806
Longitude:-15.9293383
Mass (g):1552
Pieces:1
Class:R4-5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):39.2±0.8 (N=20)
Ferrosilite (mol%):11.5±0.9 (N=15)
Wollastonite (mol%):45.0±1.1 (N=15)
Classifier:J. Llorca, UPC. J. Garcia, MCM
Type spec mass (g):20
Type spec location:UPC
Main mass:MCM
Finder:Jose Garcia
Comments:Submitted by Jose Garcia
Institutions
   and collections
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)
MCM: Museo Canario de Meteoritos Las Palmas de Gran Canaria, Spain (institutional address; updated 26 Nov 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
José García                  
Geography:

Mauritania
Coordinates:
     Recommended::   (16° 51' 14"N, 15° 55' 46"W)

Statistics:
     This is 1 of 2 approved meteorites from Trarza, Mauritania
     This is 1 of 108 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)
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