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Acfer 217 meteorite, Tamanghasset Province, Algeriai
Regional Level Types
Acfer 217 meteoriteMeteorite Fall Location
Tamanghasset ProvinceProvince
AlgeriaCountry

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Key
Latitude & Longitude (WGS84):
27° 35' 39'' North , 3° 53' 8'' East
Latitude & Longitude (decimal):
Köppen climate type:


Rumuruti-like Chondrite (R3.8-5; S2)
1991 weathered find, 174 g

Acfer 217 is a regolith breccia. Over 70 vol% of the meteorite consists of Fayalitic Olivine (mostly Fa37-39) which is dispersed between chondrules (representing ~1/3 of the stone ) and a largely recrystallized matrix. Plagioclase and Pyroxene total ~ 15 vol%. Various fragments, a few opaques, and terrestrial weathering products (≥3 vol%) account for the rest of the meteorite. Ca-rich Plagioclase is slightly more abundant than Ca-poor Plagioclase. While much of the meteorite is recrystallized, pockets of primitive lithology and regions of level S3 shock are also present. Feldspar is found both as Plagioclase and as Alkali-Feldspar. Tiny sulfides include pentlandite, troilite, and other often unidentified phases. Meteoritic (Fe-Ni) metal is either sparse or non-existent. However, tiny phases containing noble metals are found.

Acfer 217 is a member of the Rumuruti chondrite group. These chondrites are the most oxidized of all chondrite groups and are most easily identified by their dominant Olivine (Fa~40) lithology which accompanies their characteristic oxygen isotope and sub-solar bulk Mg/Si ratios. A number of the members — including Acfer 217 — have unequilibrated components which help to provide some extra mineralogical diversity for these frequently small meteorites.

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:

'Albite-Anorthite Series'
Description: Palgioclase (variable) — most important as an interstitial matrix phase
Reference: Wlotzka, F. [Ed.] (1993) Meteoritical Bulletin, no. 73: Meteoritics 27 (4): 477-483 (Sept 1992) ; Bland, P., Hutchison, R., Pillinger, C. T. & Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara-Acfer 217: Meteoritics 27 (3): 204. (July1992)
Erlichmanite
Formula: OsS2
Description: Erlichmanite(Osmium sulfide) & Laurite (Ruthenium sulfide)form solid solutions and intimate intergrowths
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
'Fayalite-Forsterite Series'
Description: Olivine is major phase of both chondrules and matrix; Most Olivines are Fayalitic (Fa ~39) but Mg-rich olivines (Fa 3-20) are also present.
Reference: Bland, P., Hutchison, R., Pillinger, C. T. & Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara-Acfer 217: Meteoritics 27 (3): 204. (July1992); Geiger, T. & Bischoff, A. (1992) Mineralogy of Carbonaceous Chondrites and ACFER 217 from the Sahara (abstract): Meteoritics 27 (3): 223. (July 1992)
'Feldspar Group'
Description: Alkali-Feldspar (Or28) detected.
Reference: Bischoff et al. (1994) ACFER 217 - A new member of the Rumuruti chondrite group (R): Meteoritics 29 (2): 264-274. (March 1994)
Ilmenite
Formula: Fe2+TiO3
Description: Ilmenite coexists with Cr-spinel
Reference: Bischoff et al. (1994) ACFER 217 - A new member of the Rumuruti chondrite group (R): Meteoritics 29 (2): 264-274. (March 1994)
Irarsite
Formula: (Ir,Ru,Rh,Pt)AsS
Description: Along with sperrylite, most abundant of noble metal containing phases
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
Laurite
Formula: RuS2
Description: Erlichmanite (Osmium sulfide) & Laurite (Ruthenium sulfide)form solid solutions and intimate intergrowths.
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
Moncheite
Formula: (Pt,Pd)(Te,Bi)2
Description: A single grain was analyzed (Schulze,1998).
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
Moncheite var: Chengbolite
Description: A single grain was analyzed (Schulze,1998).
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
Pentlandite
Formula: (FexNiy)Σ9S8
Reference: Bischoff et al. (1994) ACFER 217 - A new member of the Rumuruti chondrite group (R): Meteoritics 29 (2): 264-274. (March 1994)
'Pyroxene Group'
Description: both Ca-rich & Ca-poor pyroxene of varying composition with Ca-poor pyroxenes more notably unequilibrated (Fs 3-32; mean: Fs25)
Reference: Wlotzka, F. [Ed.] (1993) Meteoritical Bulletin, no. 73: Meteoritics 27 (4): 477-483 (Sept 1992) ; Bland, P., Hutchison, R., Pillinger, C. T. & Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara-Acfer 217: Meteoritics 27 (3): 204. (July1992); Geiger, T. & Bischoff, A. (1992) Mineralogy of Carbonaceous Chondrites and ACFER 217 from the Sahara (abstract): Meteoritics 27 (3): 223. (July 1992)
Sperrylite
Formula: PtAs2
Description: Along with irarsite - most abundant of noble metal containing phases
Reference: Schulze, H. (1998) Meteoritics & Planetary Science 33 (4, Supplement): A139. (July 1998)
Spinel
Formula: MgAl2O4
Description: Frequently Cr-rich, but more generally is predominantly a mixture of chromite, magnetite, and ulvospinel end members. Spinel assembladges are also frequently surrounded with terrestrial weathering products
Reference: Wlotzka, F. [Ed.] (1993) Meteoritical Bulletin, no. 73: Meteoritics 27 (4): 477-483 (Sept 1992) ; Bland, P., Hutchison, R., Pillinger, C. T. & Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara-Acfer 217: Meteoritics 27 (3): 204. (July1992); Bischoff et al. (1994) ACFER 217 - A new member of the Rumuruti chondrite group (R): Meteoritics 29 (2): 264-274. (March 1994)
Troilite
Formula: FeS
Description: Extremely rare
Reference: Bland, P., Hutchison, R., Pillinger, C. T. & Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara-Acfer 217: Meteoritics 27 (3): 204. (July1992)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Erlichmanite2.EB.05aOsS2
Irarsite2.EB.25(Ir,Ru,Rh,Pt)AsS
Laurite2.EB.05aRuS2
Moncheite2.EA.20(Pt,Pd)(Te,Bi)2
var: Chengbolite2.EA.20(Pt,Pd)(Te,Bi)2
Pentlandite2.BB.15(FexNiy)Σ9S8
Sperrylite2.EB.05aPtAs2
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Spinel4.BB.05MgAl2O4
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 9:8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
AmBnXp, with (m+n):p = 1:2
Erlichmanite2.12.1.16OsS2
Irarsite2.12.3.7(Ir,Ru,Rh,Pt)AsS
Laurite2.12.1.10RuS2
Moncheite2.12.14.3(Pt,Pd)(Te,Bi)2
Sperrylite2.12.1.13PtAs2
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Feldspar Group'-
Moncheite
var: Chengbolite
-(Pt,Pd)(Te,Bi)2
'Pyroxene Group'-

List of minerals for each chemical element

OOxygen
O SpinelMgAl2O4
O IlmeniteFe2+TiO3
MgMagnesium
Mg SpinelMgAl2O4
AlAluminium
Al SpinelMgAl2O4
SSulfur
S TroiliteFeS
S Pentlandite(FexNiy)Σ9S8
S ErlichmaniteOsS2
S Irarsite(Ir,Ru,Rh,Pt)AsS
S LauriteRuS2
TiTitanium
Ti IlmeniteFe2+TiO3
FeIron
Fe TroiliteFeS
Fe IlmeniteFe2+TiO3
Fe Pentlandite(FexNiy)Σ9S8
NiNickel
Ni Pentlandite(FexNiy)Σ9S8
AsArsenic
As Irarsite(Ir,Ru,Rh,Pt)AsS
As SperrylitePtAs2
RuRuthenium
Ru Irarsite(Ir,Ru,Rh,Pt)AsS
Ru LauriteRuS2
RhRhodium
Rh Irarsite(Ir,Ru,Rh,Pt)AsS
PdPalladium
Pd Moncheite(Pt,Pd)(Te,Bi)2
TeTellurium
Te Moncheite(Pt,Pd)(Te,Bi)2
OsOsmium
Os ErlichmaniteOsS2
IrIridium
Ir Irarsite(Ir,Ru,Rh,Pt)AsS
PtPlatinum
Pt Irarsite(Ir,Ru,Rh,Pt)AsS
Pt SperrylitePtAs2
Pt Moncheite(Pt,Pd)(Te,Bi)2
BiBismuth
Bi Moncheite(Pt,Pd)(Te,Bi)2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Wlotzka, F. [Ed.] (1993) Meteoritical Bulletin, no. 73. Meteoritics, 27(4), 477-483 (Sept 1992).
Bland, P., Hutchison, R., Pillinger, C.T., Bischoff, A. (1992) A Unique Type 4 Chondrite from the Sahara - Acfer 217. Meteoritics, 27(3), 204 (July 1992).
Geiger, T., Bischoff, A. (1992) Mineralogy of Carbonaceous Chondrites and ACFER 217 from the Sahara (abstract). Meteoritics, 27(3), 223 (July 1992).
Bischoff et al. (1994) ACFER 217 - A new member of the Rumuruti chondrite group (R). Meteoritics, 29(2), 264-274 (March 1994).
Schulze, H. (1998) Meteoritics & Planetary Science, 33 (4, Supplement), A139 (July 1998).

External Links

https://www.lpi.usra.edu/meteor/metbull.php?code=225 = Acfer 217 @ Meteoritical Bulletin Database


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