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Errachidia 002
Basic information Name: Errachidia 002
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 21.3 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 315 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 31 Aug 2018
Writeuphelp
Writeup from MB 107:

Errachidia 002        31°52’03.4"N, 4°09’55.2"W

Draâ-Tafilalet, Morocco

Find: 2017

Classification: HED achondrite (Eucrite, polymict)

History: (H. Chennaoui Aoudjehane, FSAC) Found in a flat area SE of Errachidia called An-Nebch around 8 km NE of a Jramena village. A single piece of 4.02 g was collected on 11 Oct 2017 in the field during a systematic prospecting mission by a team of PhD students (FSAC) with H. Chennaoui. This area was selected because of the report of the first sample 17.24 g that was found there by a hunter on January 2017.

Physical characteristics: (H. Chennaoui Aoudjehane) One stone partially covered by a shiny fusion crust. Fresh pieces showing a low weathering grade. Clear grains of a small size (up to 1 mm) are visible through the fusion crust. The fractured face shows brecciation with dark and clear areas. Up to 1 mm sized grains of fresh unoxidized metal are present in the cut portion.

Petrography: (T. Shisseh, FSAC; R. Hewins, S. Pont, MNHNP) Breccia with rock fragments up to 0.7 mm and lithic clasts up to 1 mm embedded in a fine grained clastic matrix. Grains of exsolved low-Ca pyroxene with up to 16 μm exsolution lamellae, fractured with a 6 μm displacement and distorted, are present in the lithic clasts and the matrix. Contains shock veins up to 0.2 mm with entrained rounded grains of pyroxene, plagioclase and silica. A faulting surface was also observed extending over 1.5 mm. The main minerals are Ca-poor pyroxene, augite and plagioclase, with minor silica, ilmenite, chromite and pure Fe-metal.

Geochemistry: Mineral compositions and geochemistry: (T. Shisseh, H. Chennaoui Aoudjehane, FSAC) Orthopyroxene compositions are En37.9Fs59.5Wo2.6, low-Ca pyroxenes En32.7Fs61.8Wo5.6 to En31.2Fs59.3Wo18.3 (N=7), augite En51.9Fs27.2Wo20.9 to En26.9Fs29.8Wo43.4 (N=4) Fe/Mn=30 in average. Plagioclase is An95.2-87.9 Ab4.64-11.7 Or0.12-0.5 (N=6).

Classification: (H. Chennaoui Aoudjehane, T. Shisseh, FSAC) Polymict eucrite breccia. The meteorite contains anorthite, and pyroxene with Fe/Mn ratios matching eucrite, plus typical eucrite textures.

Specimens: The main mass 17.24 g is held by a private collector. The type specimen consists of 4.4 g and one polished section in FSAC.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Draâ-Tafilalet
Origin or pseudonym:Flat desert area
Date:2017
Latitude:31°52'03.4"N
Longitude:4°09'55.2"W
Mass (g):21.26
Pieces:2
Class:Eucrite-pmict
Weathering grade:low
Ferrosilite (mol%):49.6±12.9 (27.2-61.8, N=12)
Wollastonite (mol%):16.64±13.8 (2.5-43.3)
Magnetic suscept.:3.56
Classifier:H. Chennaoui Aoudjehane, T. Shisseh, FSAC
Type spec mass (g):4.4
Type spec location:FSAC
Main mass:Private collector Casablanca
Finder:Tarik Hezzi (Errachidia)
Comments:Submitted by T. Shisseh
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address; updated 17 Sep 2018)
FSAC: Universite Hassan II Casablanca, Faculte des Sciences Ain Chock, Departement de Géologie, BP 5366 Maârif, Casablanca, Morocco (institutional address; updated 9 Jan 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Geography:

Morocco
Coordinates:
     Recommended::   (31° 52' 3"N, 4° 9' 55"W)

Statistics:
     This is the only approved meteorite from Draâ-Tafilalet, Morocco
     This is 1 of 1302 approved meteorites from Morocco (plus 12 unapproved names) (plus 1 impact crater)
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