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Acfer 211 meteorite, Aguemour, Tamanrasset, Tamanghasset Province, Algeriai
Regional Level Types
Acfer 211 meteoriteMeteorite Fall Location
Aguemour- not defined -
Tamanrasset- not defined -
Tamanghasset ProvinceProvince
AlgeriaCountry

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Key
Latitude & Longitude (WGS84):
27° 27' 54'' North , 3° 46' 54'' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:


Ordinary chondrite, unequilibrated & brecciated (H3.9,br; S2; W2)
Found,1991; 1009 g

The Acfer 211 meteorite is a small and moderately unequilibrated meteorite found during an expedition to the Sahara Desert. In thin sections, its most obvious constituents are distinct chondrules (~380 µm, mean diam.) usually dominated by olivine, pyroxene (mostly orthopyroxene), and minor plagioclase. Olivine (Fa18.5±3.8) and, especially, pyroxene (Fs17.2.4±6.4) are unequilibrated. Aggregates of Fe-Ni metal and troilite are found in the interstices between chondrules. Mean composition of olivine and orthopyroxene are characteristic of the H (high iron) ordinary chondrite group. Undulatory extinction and irregular fractures of olivine are characteristic of mild shock (level S2). Weathering grade reflects a modest degree of rustiness.

A cosmic ray exposure age of ~27 Ma and estimated pre-terrestrial radius of 10 cm is reported by Romstedt et al. (1996).

Regions containing this locality

African PlateTectonic Plate
Sahara Desert, North AfricaDesert
Northwest Africa MeteoritesMeteorite Fall Location

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


2 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
'Fayalite-Forsterite Series'
Reference: Wlotzka, F. (1992). The Meteoritical Bulletin, No. 72. Meteoritics 27 (1): 109-117. (March 1992).; Bischoff, A., Sears, D.W.G., Benoit, P.H., Geiger, T., & Stoeffler, D. (1992) New Type 3 Ordinary Chondrites from the Sahara Desert: Lunar and Planetary Science Conference (Abstracts) 23: 107-108. (March 1992).; Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
Forsterite
Formula: Mg2SiO4
Description: A few grains of forsterite [sensu strictu, Fa<10] are found.
Reference: Bischoff, A., Sears, D.W.G., Benoit, P.H., Geiger, T., & Stoeffler, D. (1992) New Type 3 Ordinary Chondrites from the Sahara Desert: Lunar and Planetary Science Conference (Abstracts) 23: 107-108. (March 1992).
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Bischoff, A., Sears, D.W.G., Benoit, P.H., Geiger, T., & Stoeffler, D. (1992) New Type 3 Ordinary Chondrites from the Sahara Desert: Lunar and Planetary Science Conference (Abstracts) 23: 107-108. (March 1992).
'Meteoritic Iron'
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
'Orthopyroxene Subgroup'
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
'Pyroxene Group'
Reference: Wlotzka, F. (1992). The Meteoritical Bulletin, No. 72. Meteoritics 27 (1): 109-117. (March 1992).; Bischoff, A., Sears, D.W.G., Benoit, P.H., Geiger, T., & Stoeffler, D. (1992) New Type 3 Ordinary Chondrites from the Sahara Desert: Lunar and Planetary Science Conference (Abstracts) 23: 107-108. (March 1992).
Troilite
Formula: FeS
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 9 - Silicates
Forsterite9.AC.05Mg2SiO4
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Limonite'-(Fe,O,OH,H2O)
'Meteoritic Iron'-
'Orthopyroxene Subgroup'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Limonite'-(Fe,O,OH,H2O)
'Meteoritic Iron'-
'Orthopyroxene Subgroup'-
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O ForsteriteMg2SiO4
O Limonite(Fe,O,OH,H2O)
MgMagnesium
Mg ForsteriteMg2SiO4
SiSilicon
Si ForsteriteMg2SiO4
SSulfur
S TroiliteFeS
FeIron
Fe Limonite(Fe,O,OH,H2O)
Fe TroiliteFeS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Wlotzka, F. (1992) The Meteoritical Bulletin, No. 72. Meteoritics, 27(1), 109-117 (March 1992).
Bischoff, A., Sears, D.W.G., Benoit, P.H., Geiger, T., Stoeffler, D. (1992) New Type 3 Ordinary Chondrites from the Sahara Desert. Lunar and Planetary Science Conference (Abstracts), 23, 107-108 (March 1992).
Romstedt, J., Schultz, L., Metzler, K. (1996) Nuclear Tracks and Noble Gases in Ten Unequilibrated H-Chondrites from the Sahara. Lunar and Planetary Science, 27, 1101-1102 (March 1996).
Grady, M.M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Grady, M.M., Pratesi, G., Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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