header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 20 Feb 2024
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Erg Chech 012
Basic information Name: Erg Chech 012
     This is an OFFICIAL meteorite name.
Abbreviation: EC 012
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 25 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 318 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 11 Dec 2022
Writeuphelp
Writeup from MB 111:

Erg Chech 012 (EC 012)        26º13.5425’N , 01º45.6455’W

Adrar, Algeria

Purchased: 2022

Classification: Martian meteorite (Shergottite)

History: The meteorite was found by a nomad and purchased by Carlos Muñecas Muñoz (Expometeoritos) from a dealer in Morocco in June of 2022.

Physical characteristics: Sample is irregularly shaped and lacks fusion crust. The cut face shows the interior is light greenish- gray and crystalline.

Petrography: Description and classification (A. Love, App) Sample has a diabasic texture composed of (vol%): 1-2 mm sized twinned, prismatic pyroxenes (60); lath-shaped regions of maskelynite (35), some of which are surrounded by later stage K-bearing glass. Pyroxenes are strongly zoned (cores show thin exsolution lamellae). Additional minerals are: fayalitic olivine (Fa91), a silica polymorph, calcite, merrillite, Cl-apatite, ulvospinel, ilmenite and pyrrhotite.

Geochemistry: (A.Patchen, UTK) Pigeonite cores (Fs33.2±2.2Wo11.8±1.4, Mg#62.3±2.3, Fe/Mn=29.7±0.9, n=12); augite cores (Fs23.6±1.8Wo33.4±1.6, Mg#64.6±2.2, Fe/Mn=28.8±1.6, n=31); pigeonite rims (Fs62.8±5.3Wo15.3±2.0, Mg#25.7±6.8, Fe/Mn=37.7±1.1, n=53); augite rims (Fs60.9±7.0Wo21.3±4.6, Mg#=22.6±7.3, Fe/Mn=37.8±1.9, n=52); maskelynite (An56.0±2.4Or1.4±0.5, n=13); non-stoichiometric anorthoclase (Ab37.1Or27.0); Ti-magnetite (Sp4.2±0.8Chr1.2±0.9Usp69.1±2.5Mt25.5±2.5, Mg#=0.9±0.5, n=58); ilmenite (Ilm95.2±0.8Hem1.9±1.0, n=40); fayalite(Fa91.1±2.2, Fe/Mn=52.1±2.5, n=24).

Classification: Martian achondrite (basaltic shergottite). Based on texture, unequilibrated mineralogy, Fe/Mn ratio measured from pyroxenes, sample is a basaltic shergottite.

Specimens: Carlos Muñecas Muñoz (Expometeoritos) holds the main mass. A polished thin section and an endcut and slice weighing a total of 5 g are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Adrar
Place of purchase:Morocco
Date:P 2022
Latitude:26º13.5425’N
Longitude:01º45.6455’W
Mass (g):25
Pieces:1
Class:Martian (shergottite)
Shock stage:M-S4
Weathering grade:low
Ferrosilite (mol%):33.2±2.2; 23.6±1.8; 62.8±5.3; 60.9±7.0
Wollastonite (mol%):11.8±1.4; 33.4±1.6; 15.3±2.0; 21.3±4.6
Classifier:A. Love, App
Type spec mass (g):5
Type spec location:App
Main mass:Carlos Muñecas Muñoz (Expometeoritos)
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 16 Feb 2024)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ron   
Geography:

Algeria
Coordinates:
     Recommended::   (26° 13' 33"N, 1° 45' 39"W)

Statistics:
     This is 1 of 199 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1335 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page