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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:
Meteoritical Bulletin:  MB 109  (2021)  R4-5
Recommended:  R4-5    [explanation]

This is 1 of 7 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 Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Cute child   
Ryan Upchurch   
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 227 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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