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Hassi el Biod 001
Basic information Name: Hassi el Biod 001
     This is an OFFICIAL meteorite name.
Abbreviation: HeB 001
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 763 g
Classification
  history:
Recommended:  Diogenite-an    [explanation]

This is 1 of 6 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 18 Dec 2020
Writeuphelp
Writeup from MB 109:

Hassi el Biod 001 (HeB 001)        28°46’16.10"N, 05°30’10.00"E

Ouargla, Algeria

Purchased: 2020 Jan 2

Classification: HED achondrite (Diogenite, anomalous)

History: The meteorite was found by a nomad named Abo Zaid on January 2, 2020, in the great Sahara south of the village of Wargla, Algeria, and subsequently purchased by the main mass holder, Said Yousfi.

Physical characteristics: Light-brownish rock with very minor fusion crust.

Petrography: Unbrecciated ultramafic rock displaying a cumulate texture of up to 0.6 mm sized low-Ca pyroxene poikilitically enclosing rounded to subrounded olivine grains 20 to 400 µm in size. Most regions are pyroxene-dominated while few contain abundant clustered olivine grains. Pyroxene is compositionally zoned, i.e., exhibits Mg-rich cores and Fe-rich rims. Olivine grains are compositionally homogeneous but of four distinct compositions varying in Fe/Mg ratios. Many olivine grains show outer rims of symplectic intergrowth of chromite and silica. Plagioclase is a minor component typically occurring interstitial to pyroxene and olivine and is of highly variable composition. Opaques include Ti-poor zoned chromite, troilite blebs, and kamacite often intergrown with FeS.

Geochemistry: low-Ca pyroxene: Fs23.7±2.3Wo2.8±1.2 (Fs17.7-28.8Wo1.8-4.8, FeO/MnO=22-32, n=39); predominant olivine: Fa28.9±0.2 (Fa28.6-29.1, FeO/MnO=41±2, n=22); Fe-rich olivine: Fa31.0±0.1 (Fa30.8-31.2, FeO/MnO=40±2, n=5); intermediate olivine: Fa25.6±0.1 (Fa25.4-25.8, FeO/MnO=43±2, n=5); Fe-poorer olivine: Fa24.1±0.2 (Fa23.9-24.3, FeO/MnO=42±4, n=5); plagioclase: An84.5±4.1Ab14.9±3.9Or0.5±0.2 (An76.2-91.3Ab8.4-22.5Or0.3-1.4, n=19); chromite: Cr2O3 45.22-52.41, TiO2 0.84-1.24, Al2O3 14.31-20.17, MgO 5.82-6.91 (all in wt%); Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=3.816, 3.852, 3.830; δ17O=1.734, 1.753, 1.748; Δ17O= -0.280, -0.280, -0.274 (all per mil)

Classification: Achondrite (diogenite-anomalous, harzburgitic). The anomalous designation comes from the texture (pronounced cumulate texture of orthopyroxene poikilitically enclosing rounded olivine), and the oxygen isotopic composition that is apart from typical diogenites.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Ouargla
Place of purchase:Algeria
Date:P 2020 Jan 2
Latitude:28°46'16.10"N
Longitude:05°30'10.00"E
Mass (g):763
Pieces:1
Class:Diogenite-an
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):28.9; 31.0; 25.6; 24.1
Ferrosilite (mol%):23.7
Wollastonite (mol%):2.8
Magnetic suscept.:2.98
Classifier:A. Greshake, MNB
Type spec mass (g):21.3
Type spec location:MNB
Main mass:Said Yousfi
Comments:Submitted by Ansgar Greshake
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake            
Geography:

Algeria
Coordinates:
     Recommended::   (28° 46' 16"N, 5° 30' 10"E)

Statistics:
     This is 1 of 29 approved meteorites from Ouargla, Algeria
     This is 1 of 1073 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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