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Tanezrouft 057
Basic information Name: Tanezrouft 057
     This is an OFFICIAL meteorite name.
Abbreviation: Tnz 057
Observed fall: No
Year found: 2002
Country: Algeria
Mass:help 5.4 kg
Meteoritical Bulletin:  MB 87  (2003)  C4
MetBase:  v. 7.1  (2006)  CK4-an
Recommended:  CK4-an    [explanation]

This is 1 of 3 approved meteorites classified as CK4-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Writeup from MB 87:

Tanezrouft 057


Found 2002 December 23

Carbonaceous chondrite (C4)

A large (5.4 kg), dark grey, moderately compact stone, lacking fusion crust was found by F. Beroud and C. Boucher. Mineralogy and classification (B. Devouard and J.-L. Devidal, UBP; B. Zanda and M. Denise, MNHNP): large chondrules (around 1 mm in diameter), matrix around 50% but locally more abundant (~70%), numerous irregular whitish inclusions up to 3 mm, and occasional zoned CAIs up to 17 mm. In addition, several large (up to 2.5 cm) dark grey inclusions show a finer grained petrology, with no (or extremely rare) chondrules or CAIs. More of these fine-grained inclusions are visible at the surface of the hand sample. The meteorite is nearly equilibrated: olivines are around Fa30 ± 4 except for a few unequilibrated chondrules; OPX range from Fs3 to Fs30, with a mean at Fs19. The groundmass is highly recrystallized, with homogeneous olivine, orthopyroxene and plagioclase grains around 100 µm in size. The groundmass is texturally equilibrated, although most grains seem to be porous. Magnetite is the dominant opaque mineral, associated with minor FeS, Ni-rich monsulfide, minor pentlandite and possibly pyrite. Outside chondrules, small magnetite grains and minute sulfide grains are scatterred within the matrix. No metal was observed. However, iron hydroxides patches are visible, and metal or sulfides may be have been obliterated by terrestrial weathering. The numerous irregular inclusions retain a fine-grained texture made of plagioclase and clinopyroxene that may be metamorphosed CAIs. The overall characteristics of this meteorite are consistant with a C4 classification, with affinities to the CV oxidized subgroup and/or the CK group. Specimens: type specimen, 110 g, MNHNP; main mass with finders.

Data from:
  Table 5
  Line 30:
Mass (g):5400
Class:CK4 an
Classifier:B. Devouard and J.-L. Devidal, UBP, B. Zanda and M. Denise, MNHNP
Type spec mass (g):110.0
Main mass:F. Beroud and C. Boucher
Finder:F. Beroud and C. Boucher
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Beroud: F. Beroud, Chatel-Guyon, France; Website (private address)
Boucher: C. Boucher, Lyon, France (private address)
UBP: Universite Blaise Pascal, Clermont-Ferrand, France (institutional address)
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
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    (Caution, these are of unknown reliability)

     Recommended::   (25° 16'N, 0° 9'E)

     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)
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