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Tassédet 004
Basic information Name: Tassédet 004
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2016
Country: Niger
Mass:help 405 kg
Meteoritical Bulletin:  MB 108  (2020)  H5-melt breccia
Recommended:  H5-melt breccia    [explanation]

This is 1 of 40 approved meteorites classified as H5-melt breccia.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 4 Jul 2019
Writeup from MB 108:

Tassédet 004        ~18°40’30"N, ~7°23’53"E

Agadez, Niger

Find: 2016

Classification: Ordinary chondrite (H5, melt breccia)

History: A large stone of 405 kg was found around 5 km SE of Akokan. It is probably part of a large strewnfield extending for kilometers. Tassédet 004 is widely traded under the name "Tchifaddine."

Physical characteristics: Interior shows little to no signs of weathering. Exterior largely dark colored with protruding metal clasts, typically cm-sized.

Petrography: Examination of multiple kg of material shows considerable variation in petrography and clast size. This description is based on two representative slices (10 × 8 cm and 18 × 18 cm) and two polished microprobe mounts. The polished slices are dominated by black rounded clasts, surrounded by lighter-colored quenched melt and igneous-textured microporphyritic melt domains. The black clasts show an even distribution of metal and sulfide, typically <500 μm across, and significant porosity as vesicles 10 to 200 μm, some with euhedral grains protruding into the voids. Rare melt pockets to 100 μm. In the two sections, the chondrules in the black clasts are largely integrated into the matrix. A few PO and BO chondrules were recognized. The silicates contain an abundance of small, <1 μm, sulfide and metal grains. Clast metal dominated by kamacite, lacks Neumann bands, is anhedral though with curved outlines. It is typically single crystal, though some show a lath-like martensitic texture. Most kamacite grains have a "frothy" coating of troilite. Troilite is single crystal to polycrystalline and lacks shock lamellae. Metal/troilite grains >2 mm in the melt show eutectic textures. Grains smaller than 2 mm consist of Fe-Ni spheres with coatings of troilite. Chromite is a common accessory as anhedral grains to 200 μm. Feldspar, as anhedral grains, have a wide size distribution from <10 to >50 μm.

Geochemistry: (L. Garvie, ASU) Black clast: Olivine Fa19.3±1.2, range Fa18.5-22.1, FeO/MnO=39.9±2.9, CaO to 2.2 wt%, Cr2O3=0.1±0.03, range 0.04 to 0.14 wt%, n=9. Low Ca pyroxene, Fs16.7±0.9Wo1.8±0.5, FeO/MnO=23.4±2.5, n=10. Two high-Ca pyroxene grains found, Fs6.8Wo44.4 and Fs6.1Wo45.4. Feldspar Or2.0±0.4Ab76.2±0.9, n=5.

Classification: H5-melt breccia. Low weathering, W1, and high shock. Mineralogy and petrography are similar to the Gao-Guenie H5 melt breccia (Schmieder et al., 2016). Tassedet 004 is widely traded under the name Tchifaddine.

Specimens: 1237 g at ASU.

  • Schmieder M., Kring D.A., Swindle T.D., Bond J.C., and Moore C.B. (2016) The Gao-Guenie impact melt breccia—Sampling a rapidly cooled impact melt dike on an H chondrite asteroid? Meteorit. Planet. Sci. 51, 1022-1045. (link)
Data from:
  Table 0
  Line 0:
Origin or pseudonym:open desert
Place of purchase:Beijing/Morocco/Tucson
Mass (g):405000
Class:H5-melt breccia
Shock stage:high
Weathering grade:W1
Fayalite (mol%):19.3±1.2
Ferrosilite (mol%):16.7±0.9
Wollastonite (mol%):1.8±0.5
Classifier:L. Garvie, ASU
Type spec mass (g):1237
Type spec location:ASU
Main mass:many locations
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     Recommended::   (18° 40' 30"N, 7° 23' 53"E)

     This is 1 of 54 approved meteorites from Agadez, Niger
     This is 1 of 120 approved meteorites from Niger (plus 4 unapproved names)
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Synonymshelp: Tchifaddine (Common synonym)

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