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Essebi meteorite, Ituri, DR Congoi
Regional Level Types
Essebi meteoriteMeteorite Fall Location
IturiProvince
DR CongoCountry

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Key
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Latitude & Longitude (WGS84):
2° 52' 59'' North , 30° 49' 59'' East
Latitude & Longitude (decimal):
Meteoritical Society Class:
Köppen climate type:
Nearest Settlements:
PlacePopulationDistance
Arua55,585 (2016)17.5km
Other/historical names associated with this locality:
Zaïre
Name(s) in local language(s):
, , Democratic Republic of the Congo


Classification: Carbonaceous Chondrite, Ungrouped (C2-ung; S1)
Fall, July 28, 1957; 550 g, several fragments

After its fall, the small Essebi meteorite was soon classified as a Carbonaceous Chondrite and, in time, was deemed a member of the CM (Mighei-like) Carbonaceous Chondrite Group and officially remained so until early in the new millennium. Recently, however, it has been deemed to be one of only 4 ungrouped Carbonaceous Chondrite falls.

Essebi has not been the object of extensive research. The listing provided here is based on readily available sources and includes several minerals from an intriguing refractory inclusion. It lacks, however, the pyroxenes, feldspars and various opaques which would presumably be reported in a comprehensive mineralogical study.

Regions containing this locality

Somali Plate (Somalia Plate)Tectonic Plate
Orientale, DR CongoProvince (Historical)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


11 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:

Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Augite var: Fassaite
Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Calcite
Formula: CaCO3
Description: From altered Melilite in inclusions
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Cronstedtite
Formula: Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Reference: Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.
Diopside
Formula: CaMgSi2O6
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
'Fayalite-Forsterite Series'
Reference: Zolensky, M. E. (1991) Mineralogy and matrix composition of CR chondrites Renazzo and EET 87770, and ungrouped chondrites Essebi and MAC 87300. In: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society: p 263. (Jan 1991).; Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.
Hibonite
Formula: (Ca,Ce)(Al,Ti,Mg)12O19
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Kallemeyn, G. W. (1995) Bells and Essebi: To Be or Not To Be (CM). Meteoritics 30 (5): 525-526. (Sept 1995); Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.
'Melilite Group'
Formula: Ca2M(XSiO7)
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Perovskite
Formula: CaTiO3
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
'Pyroxene Group'
Reference: Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.
Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Reference: Zolensky, M. E. (1991) Mineralogy and matrix composition of CR chondrites Renazzo and EET 87770, and ungrouped chondrites Essebi and MAC 87300. In: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society: p 263. (Jan 1991).
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: Zolensky, M. E. (1991) Mineralogy and matrix composition of CR chondrites Renazzo and EET 87770, and ungrouped chondrites Essebi and MAC 87300. In: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society: p 263. (Jan 1991).; Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.
Sodalite
Formula: Na8(Al6Si6O24)Cl2
Description: From altered Melilite in inclusions
Reference: El Goresy et al. (1984) A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984)
Spinel
Formula: MgAl2O4
Description: Significant compositional variations in various environments (various inclusions)
Reference: Brearley, A. J. & Jones, R. H. (1998). Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Hibonite4.CC.45(Ca,Ce)(Al,Ti,Mg)12O19
Magnetite4.BB.05Fe2+Fe3+2O4
Perovskite4.CC.30CaTiO3
Spinel4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
var: Fassaite9.DA.15(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Cronstedtite9.ED.15Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Diopside9.DA.15CaMgSi2O6
Nepheline9.FA.05Na3K(Al4Si4O16)
Saponite9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Sodalite9.FB.10Na8(Al6Si6O24)Cl2
Unclassified Minerals, Rocks, etc.
'Fayalite-Forsterite Series'-
'Melilite Group'-Ca2M(XSiO7)
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Perovskite4.3.3.1CaTiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Spinel7.2.1.1MgAl2O4
AB12X19
Hibonite7.4.1.1(Ca,Ce)(Al,Ti,Mg)12O19
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside65.1.3a.1CaMgSi2O6
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Cronstedtite71.1.4.7Fe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Sheets of 6-membered rings with 2:1 clays
Saponite71.3.1b.2Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Nepheline76.2.1.2Na3K(Al4Si4O16)
Sodalite76.2.3.1Na8(Al6Si6O24)Cl2
Unclassified Minerals, Mixtures, etc.
Augite
var: Fassaite
-(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
'Fayalite-Forsterite Series'-
'Melilite Group'-Ca2M(XSiO7)
'Pyroxene Group'-
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
H CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O DiopsideCaMgSi2O6
O Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
O Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
O Melilite GroupCa2M(XSiO7)
O NephelineNa3K(Al4Si4O16)
O PerovskiteCaTiO3
O SodaliteNa8(Al6Si6O24)Cl2
O SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
O MagnetiteFe2+Fe23+O4
O SpinelMgAl2O4
O CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
NaSodium
Na Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Na NephelineNa3K(Al4Si4O16)
Na SodaliteNa8(Al6Si6O24)Cl2
Na SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Mg Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Mg SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Mg SpinelMgAl2O4
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Al Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Al NephelineNa3K(Al4Si4O16)
Al SodaliteNa8(Al6Si6O24)Cl2
Al SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Al SpinelMgAl2O4
SiSilicon
Si DiopsideCaMgSi2O6
Si Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Si Melilite GroupCa2M(XSiO7)
Si NephelineNa3K(Al4Si4O16)
Si SodaliteNa8(Al6Si6O24)Cl2
Si SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Si CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
ClChlorine
Cl SodaliteNa8(Al6Si6O24)Cl2
KPotassium
K NephelineNa3K(Al4Si4O16)
CaCalcium
Ca CalciteCaCO3
Ca DiopsideCaMgSi2O6
Ca Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Ca Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Ca Melilite GroupCa2M(XSiO7)
Ca PerovskiteCaTiO3
Ca SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Ti Hibonite(Ca,Ce)(Al,Ti,Mg)12O19
Ti PerovskiteCaTiO3
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Fe SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Fe MagnetiteFe2+Fe23+O4
Fe CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
ZnZinc
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CeCerium
Ce Hibonite(Ca,Ce)(Al,Ti,Mg)12O19

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoarchean
2500 - 2800 Ma



ID: 3307742

Age: Neoarchean (2500 - 2800 Ma)

Lithology: Plutonic and metamorphic

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Mesoarchean - Paleoarchean
2800 - 3600 Ma



ID: 3185751
Archean crystalline metamorphic rocks

Age: Archean (2800 - 3600 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
El Goresy, A., Palme, H., Yabuki, H., Nagel, K., Herrwerth, I. & Ramdohr, P. (1984). A calcium-aluminum-rich inclusion from the Essebi (CM2) chondrite: Evidence for captured spinel-hibonite spherules and for an ultra-refractory rimming sequence. Geochimica et Cosmochimica Acta 48 (11): 2283–2298. (Nov 1984).
Kallemeyn, G. W. (1995) Bells and Essebi: To Be or Not To Be (CM). Meteoritics 30 (5): 525-526. (Sept 1995)
Zolensky, M. E. (1991) Mineralogy and matrix composition of CR chondrites Renazzo and EET 87770, and ungrouped chondrites Essebi and MAC 87300. In: Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society: p 263. (Jan 1991).
Brearley, A. J. & Jones, R. H. (1998). Chondritic Meteorites. In: Planetary Materials (Papike, J. J., Editor): Chapter 3, 398 pages. Mineralogical Society of America: Washington, DC, USA. (1998)
Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town.
Howard, K.T., Alexander, C.M.O'D, Schrader D.L. & Dyl K.A. (2015) Classification of hydrous meteorites (CR, CM, and C2 ungrouped) by phyllosilicate fraction: PSD-XRD modal mineralogy and planetismal environments. Geochimica et Cosmochimica Acta 149, 206-222.

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