header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 17 May 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:  
Djebel Chaab 004
Basic information Name: Djebel Chaab 004
     This is an OFFICIAL meteorite name.
Abbreviation: Cha 004
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 2.08 kg
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 9 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 10 Nov 2023
Writeuphelp
Writeup from MB 112:

Djebel Chaab 004 (Cha 004)        25.33805°N, 1.14363°E

Adrar, Algeria

Find: 2022 Dec 27

Classification: HED achondrite (Diogenite, anomalous)

History: Reportedly, a group of meteorite hunters found several pieces of this material on December 27, 2022 in the Djebel Chaab DCA, Algeria.

Petrography (K. Metzler, IfP): Polymict achondritic breccia, consisting of mineral fragments and few lithic clasts (diogenitic and eucritic), embedded in fine-grained related debris. The material is shock-compacted and thin shock veins are present. Diogenite component >90 vol%. This breccia is dominated by fragments of olivine and low-Ca pyroxene with unusually large ranges of chemical compositions. The eucrite component occurs in the shape of mineral fragments (exsolved pyroxene, plagioclase, SiO2 polymorph) and as small lithic clast. Accessories are Cr-spinel and Ni-bearing metal (3-4 wt% Ni).

Geochemistry: Mineral compositions and geochemistry: Diogenitic clasts: Mean olivine composition: Fa15.9±5.8 (Fa8.7-28.4); Fe/Mn (at.): 44.8; n=18. Mean pyroxene composition: Fs23.5±5.9Wo2.3±1.1 (Fs11.9-31.2Wo0.4-3.9); Fe/Mn (at.): 28; n=15. Eucrite clasts: Mean composition of low-Ca pyroxene (host): Fs63.3±0.3Wo2.4±0.4 (Fs62.8-63.7Wo1.9-2.8); Fe/Mn (at.): 33; n=5. Mean composition of Ca-rich pyroxene (exsolution lamellae): Fs25.7±4.5Wo40.7±1.8 (Fs21.2-31.5Wo36.6-42.2); Fe/Mn (at.): 33; n=11. Mean plagioclase composition: An89.6±5.1Or0.4±0.5 (An78.3-95.1Or0.0-1.5); n=15.

Classification: Diogenite (polymict, anomalous). The diogenite component is characterized by unusually large chemical variations of both olivine and pyroxene, which distinguishes this rock from other polymict diogenites.

Specimens: Largest specimen (835 g) with Saleh Lehsan Haidas

Data from:
  MB112
  Table 0
  Line 0:
State/Prov/County:Adrar
Date:2022 Dec 27
Latitude:25.33805°N
Longitude:1.14363°E
Mass (g):2084
Pieces:Many
Class:Diogenite-an
Shock stage:high
Weathering grade:low
Fayalite (mol%):15.9±5.8
Ferrosilite (mol%):23.5±5.9; 63.3±0.3
Wollastonite (mol%):2.3±1.1; 2.4±0.4
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Saleh Lehsan Haidas
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler            
Geography:

Algeria
Coordinates:
     Recommended::   (25° 20' 17"N, 1° 8' 37"E)

Statistics:
     This is 1 of 201 approved meteorites from Adrar, Algeria (plus 1 unapproved name)
     This is 1 of 1362 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page