Pallasite, PES
Find 1880, 36.3 kg

Found just over a kilometer from the town of Eagle Station, the Eagle Station meteorite is a Pallasite, but a very unusual one. Apparently, scientists are not the only ones to appreciate Eagle Station's unusual characteristics. Fragments from the same meteorite were apparently buried in the Turner Mounds of the Little Miami Valley in southern Ohio.

Like all Pallasites the Eagle Station Pallasite's primary constituents are olivine (~78 vol%) and Fe-Ni metal(~21vol%). The olivine (Fa20) is, however, richer in iron than most Pallasites, the 'main group' Pallasites. And, its Fe-Ni metal is richer in nickel (15.37% Ni) than the 'main group' Pallasites. Even more important, its oxygen isotope ratios differ so much from the Main Group Pallasites that to most geochemists and meteoriticists it seems almost inconceivable that the Eagle Station Pallasite (and 3 similar Pallasites) would be derived from the same original homeworld. So, in fact, Eagle Station is the prototype for the 'Eagle Station grouplet' [PES = Pallasite, Eagle Station (subtype)]. In addition to the olivine and metal, Eagle Station also has very minor amounts of orthopyroxene, Ca-rich clinopyroxene, sulfates, troilite, and schreibersite. These constituents are not that unusual, but the minor minerals also have additional variations in trace elements which further differentiate the PES Pallasites from the Main Group.

Eagle Station is one of 25 Kentucky meteorites discovered before 2014. The only other Kentucky Pallasite, Mount Vernon, is a Main Group Pallasite. The main mass of the meteorite is held in the Naturhistorisches Museum in Wiens (Vienna)

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

11 valid minerals.

Meteorite/Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ PES pallasite meteorite

Detailed Mineral List:

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

Reference: Farrington, O.C., 1915, Catalogue of the meteorites of North America to January 1, 1909: National Academy of Sciences, Memoir 13, 513 pages.

ⓘ 'Clinopyroxene Subgroup'

Description: Clinopyroxene Ca-rich (Wo45Fs7) in at least one instance.

Reference: Mittlefehldt, D.W., McCoy, T.J., Goodrich, C.A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. IN: Papike, J. J. (ed.): Planetary Materials: Mineralogical Society of America, Washington. 195 pages.

ⓘ Diopside

Formula: CaMgSi₂O₆

Reference: Davis, A. M., & Olsen, E. J. (1989, March). The origin of phosphate minerals in the Eagle Station and Springwater pallasites. In Lunar and Planetary Science Conference (Vol. 20, p. 220).

ⓘ Enstatite

Formula: Mg₂Si₂O₆

ⓘ 'Fayalite-Forsterite Series'

Description: Olivine (Fa19Fo80)in Mittlefehldt et al., (1998). Olivine (Fa20) according to Grady (2000). Olivine accounts for 75-80% of the silicate inventory.

Reference: Radiation Measurements Volume 25, Issues 1-4, 1995, Pages 329-330 ; Mittlefehldt, D.W., McCoy, T.J., Goodrich, C.A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. IN: Papike, J. J. (ed.): Planetary Materials: Mineralogical Society of America, Washington. 195 pages.; Farrington, O.C., 1915, Catalogue of the meteorites of North America to January 1, 1909: National Academy of Sciences, Memoir 13, 513 pages.

ⓘ Forsterite

Formula: Mg₂SiO₄

ⓘ Iron

Formula: Fe

Reference: Buseck, P. R. (1977) Pallasite meteorites—mineralogy, petrology, and geochemistry. Geochimica et Cosmochimica Acta 41: 711-740. ; Mason, B. (1962) The Pallasites: American Museum Novitates, #2163. 19 pages . (Dec 1963)

ⓘ Iron var. Kamacite

Formula: (Fe,Ni)

ⓘ Merrillite

Formula: Ca₉NaMg(PO₄)₇

Reference: www.lpi.usra.edu/meetings/metsoc2003/pdf/5007.pdf.

ⓘ 'Orthopyroxene Subgroup'

ⓘ 'Plessite'

Reference: Mason, B. (1962) The Pallasites: American Museum Novitates, #2163. 19 pages . (Dec 1963)

ⓘ Schreibersite

Formula: (Fe,Ni)₃P

Description: Quite minor

Reference: Farrington, O.C., 1915, Catalogue of the meteorites of North America to January 1, 1909: National Academy of Sciences, Memoir 13, 513 pages.; Buseck, P.R. (1977) Pallasite meteorites-mineralogy, petrology, and geochemistry. Geochim Cosmochim Acta 41:711-740.

ⓘ Stanfieldite

Formula: Ca₄Mg₅(PO₄)₆

Reference: www.lpi.usra.edu/meetings/metsoc2003/pdf/5007.pdf.; Davis, A. M., & Olsen, E. J. (1989, March). The origin of phosphate minerals in the Eagle Station and Springwater pallasites. In Lunar and Planetary Science Conference (Vol. 20, p. 220).

ⓘ Taenite

Formula: (Fe,Ni)

Reference: Farrington, O.C., 1915, Catalogue of the meteorites of North America to January 1, 1909: National Academy of Sciences, Memoir 13, 513 pages.; Mason, B. (1962) The Pallasites: American Museum Novitates, #2163. 19 pages . (Dec 1963)

ⓘ Troilite

Formula: FeS

Reference: Clayton, R. N., Mayeda, T. K., & Epstein, S. (1978). Isotopic fractionation of silicon in Allende inclusions. In Lunar and Planetary Science Conference Proceedings (Vol. 9, pp. 1267-1278).; Davis, A. M., & Olsen, E. J. (1989, March). The origin of phosphate minerals in the Eagle Station and Springwater pallasites. In Lunar and Planetary Science Conference (Vol. 20, p. 220).

ⓘ Whitlockite

Formula: Ca₉Mg(PO₄)₆(PO₃OH)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Iron	1.AE.05	Fe
ⓘ	var. Kamacite	1.AE.05	(Fe,Ni)
ⓘ	Schreibersite	1.BD.05	(Fe,Ni)₃P
ⓘ	Taenite	1.AE.10	(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
ⓘ	Troilite	2.CC.10	FeS
Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Merrillite	8.AC.45	Ca₉NaMg(PO₄)₇
ⓘ	Stanfieldite	8.AC.70	Ca₄Mg₅(PO₄)₆
ⓘ	Whitlockite	8.AC.45	Ca₉Mg(PO₄)₆(PO₃OH)
Group 9 - Silicates
ⓘ	Diopside	9.DA.15	CaMgSi₂O₆
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	Forsterite	9.AC.05	Mg₂SiO₄
Unclassified Minerals, Rocks, etc.
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Orthopyroxene Subgroup'	-
ⓘ	'Plessite'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Whitlockite	Ca₉Mg(PO₄)₆(PO₃OH)
O	Oxygen
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
O	ⓘ Stanfieldite	Ca₄Mg₅(PO₄)₆
O	ⓘ Whitlockite	Ca₉Mg(PO₄)₆(PO₃OH)
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Forsterite	Mg₂SiO₄
Na	Sodium
Na	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Mg	Magnesium
Mg	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Mg	ⓘ Stanfieldite	Ca₄Mg₅(PO₄)₆
Mg	ⓘ Whitlockite	Ca₉Mg(PO₄)₆(PO₃OH)
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Forsterite	Mg₂SiO₄
Si	Silicon
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Forsterite	Mg₂SiO₄
P	Phosphorus
P	ⓘ Schreibersite	(Fe,Ni)₃P
P	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
P	ⓘ Stanfieldite	Ca₄Mg₅(PO₄)₆
P	ⓘ Whitlockite	Ca₉Mg(PO₄)₆(PO₃OH)
S	Sulfur
S	ⓘ Troilite	FeS
Ca	Calcium
Ca	ⓘ Merrillite	Ca₉NaMg(PO₄)₇
Ca	ⓘ Stanfieldite	Ca₄Mg₅(PO₄)₆
Ca	ⓘ Whitlockite	Ca₉Mg(PO₄)₆(PO₃OH)
Ca	ⓘ Diopside	CaMgSi₂O₆
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Troilite	FeS
Fe	ⓘ Schreibersite	(Fe,Ni)₃P
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Taenite	(Fe,Ni)
Fe	ⓘ Iron var. Kamacite	(Fe,Ni)
Fe	ⓘ Iron	Fe
Ni	Nickel
Ni	ⓘ Schreibersite	(Fe,Ni)₃P
Ni	ⓘ Taenite	(Fe,Ni)
Ni	ⓘ Iron var. Kamacite	(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)

Farrington, O.C., 1915, Catalogue of the meteorites of North America to January 1, 1909: National Academy of Sciences, Memoir 13, 513 pages.

Mason, B. (1962) The Pallasites: American Museum Novitates, #2163. 19 pages . (Dec 1963)

Bunch, T. E. & Keil, K. (1968) Chromite and Ilmenite in non-chondritic meteorites. American Mineralogist 56 (1&2):146-157. (Jan-Feb 1968)

Buseck, P.R. & Holdsworth, E. (1977) Phosphate minerals in pallasite meteorites. Mineralogical Magazine 41 (317): 91-102. (March 1977)

Buseck, P. R. (1977) Pallasite meteorites—mineralogy, petrology, and geochemistry. Geochimica et Cosmochimica Acta 41: 711-740.

Davis, A. M., & Olsen, E. J. (1989, March). The origin of phosphate minerals in the Eagle Station and Springwater pallasites. In Lunar and Planetary Science Conference (Vol. 20, p. 220).

Mittlefehldt, D.W., McCoy, T.J., Goodrich, C.A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. IN: Papike, J. J. (ed.): Planetary Materials: Mineralogical Society of America, Washington. 195 pages.

Grady, M. M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, London, New York, Oakleigh, Madrid. 689 pages.

External Links

http://www.lpi.usra.edu/meteor/metbull.php
http://kgs.uky.edu/kgsweb/olops/pub/kgs/sp01_12.pdf
http://www.minersoc.org/pages/Archive-MM/Volume_41/41-317-91.pdf

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Eagle Station meteorite, Carroll Co., Kentucky, USAiRegional Level TypesEagle Station meteoriteMeteorite Fall Location Carroll Co.County KentuckyState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }