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Ouallen meteorite, Tanezrouft, Tamanghasset Province, Algeriai
Regional Level Types
Ouallen meteoriteMeteorite Fall Location
Tanezrouft- not defined -
Tamanghasset ProvinceProvince
AlgeriaCountry

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Key
Latitude & Longitude (WGS84):
24° 10' North , 0° 5' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:


Ordinary Chondrite (H6)
Find,1936; 5.174 kg

Multiple fragments of a chondritic meteorite were found in the desert with 11 fragments at one site (4.849 kg) and 2 additional fragments at another site several hundred meters away (325 g). Initial studies suggest an H-group ordinary chondrite of advanced petrologic grade. Average Olivine (Fa20) and Pyroxene (Fs18) are characteristic of H (relatively high in total iron) ordinary chondrites. However, in some portions of the meteorite, several types of chondrules in the 0.2-2.0 mm diameter range are reported with relatively distinct boundaries between chondrules and matrix. Porphyritic chondrules are dominant, but significant numbers of prominent and sometimes glassy barred olivine (BO) chondrules are also prominent in specimens studied by Oba et al. (1998). The primary silicates are accompanied by Fe-Ni metal, troilite, and minor diopsidic clinopyroxene. Accessory chromite, copper, and isocubanite are also reported. Rare grains of Fe-poor Clinoenstatite and Forsterite [sensu stricto] are also reported.

Classification Problematics. Textural features and compositional variability of major silicates reported by Oba et al. are often inconsistent with a normal H6 classification. Whether these petrologic oddities are indicative of occasional xenoliths or a possible misclassification is not obvious from the readily available sources cited here.

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


9 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:

Chromite
Formula: Fe2+Cr3+2O4
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.; Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
Clinoenstatite
Formula: MgSiO3
Description: Rare grains of clinoenstatite (and, perhaps, orthoenstatite) [sensu stricto] Fs3-5 are present.
Reference: Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
'Clinopyroxene Subgroup'
Description: Ca-poor Clinopyroxene with ave. composition [Wo1.8En79.9Fs18.3] characteristic of H-group chondrites
Reference: Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
Copper
Formula: Cu
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Diopside
Formula: CaMgSi2O6
Description: Ave. composition of diopsidic clinopyroxene is unremarkable [Wo34.7En52.7Fs12.6], but the composition is quite variable in both chondrules and matrix.
Reference: Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
'Fayalite-Forsterite Series'
Description: Olivine Composition (Fa19) is characteristic of L-group chondrites (Mason, 1963). However, Oba et al.(1998) report significant variability within their specimen(s).
Reference: Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).; Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
Forsterite
Formula: Mg2SiO4
Description: Rare grains of Forsterite [sensu stricto] (Fa~7) are present.
Reference: Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
'Glass'
Description: Glass is apparently largely of feldspathic composition and is particularly prominent in the interstices of barred olivine chondrules.
Reference: Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
Iron
Formula: Fe
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.; Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).
Isocubanite
Formula: CuFe2S3
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Taenite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Troilite
Formula: FeS
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.; Oba, T., Nagase, K. & Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite: Bulletin Joetsu Univ. Educ. 17(2): 891-899. (March1998).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Isocubanite2.CB.55bCuFe2S3
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Group 9 - Silicates
Clinoenstatite9.DA.10MgSiO3
Diopside9.DA.15CaMgSi2O6
Forsterite9.AC.05Mg2SiO4
Unclassified Minerals, Rocks, etc.
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
AmBnXp, with (m+n):p = 1:1
Isocubanite2.9.13.3CuFe2S3
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Clinoenstatite65.1.1.1MgSiO3
Diopside65.1.3a.1CaMgSi2O6
Unclassified Minerals, Mixtures, etc.
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-
Iron-Fe

List of minerals for each chemical element

OOxygen
O ChromiteFe2+Cr23+O4
O ClinoenstatiteMgSiO3
O DiopsideCaMgSi2O6
O ForsteriteMg2SiO4
MgMagnesium
Mg ClinoenstatiteMgSiO3
Mg DiopsideCaMgSi2O6
Mg ForsteriteMg2SiO4
SiSilicon
Si ClinoenstatiteMgSiO3
Si DiopsideCaMgSi2O6
Si ForsteriteMg2SiO4
SSulfur
S IsocubaniteCuFe2S3
S TroiliteFeS
CaCalcium
Ca DiopsideCaMgSi2O6
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe IsocubaniteCuFe2S3
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
Fe IronFe
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)
CuCopper
Cu CopperCu
Cu IsocubaniteCuFe2S3

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta, 27(9), 1011-1023 (Sept 1963).
Ramdohr, P. (1973) The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Oba, T., Nagase, K., Hayashi, A. (1998) Mineralogy and petrology of chondrule in Ouallen (Tanezrouft) meteorite. Bulletin Joetsu Univ. Educ., 17(2), 891-899 (March 1998).
Grady, M.M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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