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Tindouf 005
Basic information Name: Tindouf 005
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: Algeria
Mass:help 136 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 288 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Apr 2017
Writeuphelp
Writeup from MB 106:

Tindouf 005        27º21’37.2’’N, 7º45’11.0’’W

Tindouf, Algeria

Find: 17 Apr 2013

Classification: HED achondrite (Eucrite, polymict)

History: On April 17, 2013, Mulay Ahmed found three stones near to the secondary school "12 de Octubre" in the Saharawi refugee camps in Tindouf, Algeria. The main stone was recognized as a possible achondrite specimen by meteorite collector José Antonio Sanchez Santana.

Physical characteristics: Three pieces of 126, 8 and 2 g. Irregular exterior, no fusion crust. A saw cut reveals a polymict breccia with numerous fragmental light and dark clasts.

Petrography: (J. Llorca, UPC). The meteorite is a microbreccia of clasts in a semi-opaque, dark-brown, microcrystalline, impact-melt matrix. The matrix is heterogeneous and is composed of mono and polymineralic fragments. Clast/matrix ratio is approximately 70/30. The larger clasts (maximum dimension 4 mm) are mainly of anorthositic and ophitic basalt lithologies; many have been shocked and partly granulated. The smaller clasts (minimum dimension less than 0.1 mm) are individual mineral grains (mainly pyroxene and plagioclase). Minerals are anorthite, pigeonite and augite (some with fine exsolution lamellae). Accessory minerals are ilmenite, silica polymorph and Al-Ti-bearing chromite. The section is notable for the absence of olivine.

Geochemistry: (R. Pablo Lozano, IGME). Microprobe analyses show plagioclase ranges from An94-96 with a mean of An95.4±0.5 (n=23). Pyroxene is variable in composition: pigeonite (Fs53-59Wo2-11; Fe/Mn=28-42) with a mean of Fs57.1±0.3 (n=15) and augite (Fs24-28Wo41-45; Fe/Mn=28-39) with a mean of Fs25.8±0.9 (n=12). Pigeonite and augite grains have Fe/(Fe+Mg)=0.647–0.780 with Ti/(Ti+Cr)=0.35–0.98. Chromite has Cr/(Cr+Al)=0.90. Impact melt glassy matrix composition is SiO2=49.49, Al2O3=17.05, FeO=13.33, MnO=0.18, MgO=5.09, CaO=12.56, Na2O=0.82, K2O=0.07, TiO2=0.49, Cr2O3=0.27 and P2O5= 0.04 (all in wt.%). Bulk chemistry (J. Reyes, IGME). We used 0.5 grams of sample for analysis. XRF of subsample gave abundances of (in wt.%): SiO2=46.17, TiO2=0.55, Al2O3=12.47, Fe2O3=20.51, MgO=6,38, CaO=10.72 and K2O<0.10. Na2O= 0.43 wt.% by AAS. Trace elements were measured with ICP-MS (all in ppm): Be=0.25, V=49.1, Cr=1001, Co=8.65, Ni=26.4, Cu=13, Zn=21.3, As=0.72, Se=2.77, Mo<0.5, Ag<0.1, Cd=2.61, Sb=0.38, Ba=1090, Tl<0.1, Pb<2, Th=0.33 and U=0.22. Oxygen isotopes (R. Greenwood, OU). δ17O=1.89; δ18O=4.05; Δ17O=-0.21 (all values in ‰).

Classification (R. Pablo Lozano, IGME). Achondrite, polymict eucrite. Terrestrial weathering is moderate. Tindouf 005 is similar to Dhofar 1626 but the first one has fewer anorthosites than the second one and the exolution lamellaes are quite frequent in Tindouf 005.

Specimens. Type specimen (16.9 g), two co-type specimens (1.8 + 1.3 g) and a probe mount are on deposit at Museo Geominero (IGME). A thin section is on deposit at UPC. José Antonio Sánchez Santana holds the main mass.

Data from:
  MB106
  Table 0
  Line 0:
State/Prov/County:Tindouf
Date:17 Apr 2013
Latitude:27º21'37.2''N
Longitude:7º45'11.0''W
Mass (g):136
Pieces:3
Class:Eucrite-pmict
Weathering grade:Moderate
Classifier:R.P. Lozano, IGME
Type spec mass (g):20.0
Type spec location:IGME
Main mass:José Antonio Sánchez Santana
Finder:Mulay Ahmed
Comments:Submitted by Rafael Pablo Lozano Fernández
Plots: O isotopes:  
Institutions
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)
IGME: Museo Geominero, Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain (institutional address; updated 12 Dec 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 106, in preparation (2017)
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Geography:

Algeria
Coordinates:
     Recommended::   (27° 21' 37"N, 7° 45' 11"W)

Statistics:
     This is 1 of 30 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 732 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)
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