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McKinney meteorite, Collin County, Texas, USAi
Regional Level Types
McKinney meteoriteMeteorite Fall Location
Collin CountyCounty
TexasState
USACountry

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Latitude & Longitude (WGS84):
33° 10' 59'' North , 96° 43' 0'' West
Latitude & Longitude (decimal):
33.18333,-96.71667
GeoHash:
G#: 9vghz0v4f
GRN:
N23W58
Type:
Meteorite Fall Location
Meteorite Class:
L4 chondrite meteorite
Meteoritical Society Class:
L4
Metbull:
View entry in Meteoritical Bulletin Database
Köppen climate type:
Cfa : Humid subtropical climate
Nearest Settlements:
PlacePopulationDistance
Fairview8,438 (2017)8.4km
McKinney162,898 (2017)9.6km
Prosper15,967 (2017)9.8km
Allen98,143 (2017)9.9km
Frisco154,407 (2017)10.6km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Dallas Gem and Mineral SocietyDallas, Texas45km
Dallas Paleontological SocietyDallas, Texas45km
Oak Cliff Gem and Mineral SocietyDallas, Texas45km
Pleasant Oaks Gem & Mineral ClubDallas, Texas45km
Mindat Locality ID:
290359
Long-form identifier:
mindat:1:2:290359:3
GUID (UUID V4):
0


Ordinary Chondrite, highly shocked (L4; S6)
Find, 1870; 150 kg

Two stones, the larger with a mass of ~100 kg, were found. The interior has been blackened by severe shock. Chondrules of diverse textures (up to 2 mm in diameter) are present. Troilite is found both as walnut-sized nodules and in irregular veins. Olivine (Fa24) and pyroxene composition are indicative of the L (low bulk iron) ordinary chondrite chemical group. The overall composition and primary mineralogical constituents of McKinney appear quite normal. However, for the past several decades the textural variations due to multiple impacts and subsequent terrestrial weathering has drawn continuing interest (See citations below.). Ar-Ar studies, in particular, suggest that the McKinney masses had experienced multiple impacts on its long journey from a presumed original parent body to the Texas plains. Porosity studies suggest that once arriving on earth the meteorite's pores were gradually filled with weathering products making it considerably more compact than most meteorites.

Two large masses in the 40-50 kg range were obtained by the Field Museum of Natural History in Chicago and the Naturhistorisches Museum in Wiens [Vienna]. Several institutions obtained masses in the 5 kg range (including Arizona State University and the Monnig Collection at TCU).

What's in a name?? — The proper unique name for the meteorite according to the Meteoritical Society is the 'McKinney' meteorite (as above). However, in 1954 a 1.68 kg fragment of the Sylacauga, Alabama meteorite fell near the home of a Mr. McKinney. This stone is sometimes referred to the 'McKinney fragment' with 'McKinney' serving as a synonym for Sylacauga.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


7 valid minerals.

Meteorite/Rock Types Recorded

Note: 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
ⓘ 'Fayalite-Forsterite Series'
Description: Olivine composition [Fa24] in Mason, 1963. The olivine is fractured with mosaic extinction and granulation due to shock melting and re-aggregation.
References:
Farrington, O.C. (1915). Catalogue of the meteorites of North America: Memoirs of the National Academy of Sciences, Vol. 13: Washington. 545 pages.
Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0
Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025
Dodd, R.T. & Jarosewich, E. (1979) Incipient melting in and shock classification of L-Group chondrites: Earth and Planetary Science Letters 44(2): 335-340. (Aug 1979).
Alwmark, C., Schmitz, B., Holm, S., Marone, F. & Stamponi, M. (2011) A 3-D study of mineral inclusions in chromite from ordinary chondrites using synchrotron radiation X-ray tomographic microscopy—Method and application: Meteoritics & Planetary Science 46 (8): 1071–1081. (Aug 2011).
ⓘ Isocubanite
Formula: CuFe2S3
ⓘ 'Limonite'
ⓘ 'Maskelynite'
ⓘ Merrillite
Formula: Ca9NaMg(PO4)7
ⓘ Native Iron
Formula: Fe
ⓘ Native Iron var. Kamacite
Formula: (Fe,Ni)
ⓘ Native Iron var. Martensite
Formula: Fe
ⓘ 'Pyroxene Group'
Formula: ADSi2O6
ⓘ Spinel
Formula: MgAl2O4
ⓘ Taenite
Formula: (Fe,Ni)
Description: Taenite largely unzoned (Bennett & McSween, 1996).
ⓘ Troilite
Formula: FeS
Description: Troilite widely present in polycrystalline aggregates.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Iron1.AE.05Fe
ⓘvar. Kamacite1.AE.05(Fe,Ni)
ⓘvar. Martensite1.AE.05Fe
ⓘ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
ⓘSpinel4.BB.05MgAl2O4
Group 8 - Phosphates, Arsenates and Vanadates
ⓘMerrillite8.AC.45Ca9NaMg(PO4)7
Unclassified
ⓘ'Limonite'-
ⓘ'Maskelynite'-
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Pyroxene Group'-ADSi2O6

List of minerals for each chemical element

OOxygen
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ SpinelMgAl2O4
Oⓘ MerrilliteCa9NaMg(PO4)7
Oⓘ Fayalite-Forsterite Series
Oⓘ Pyroxene GroupADSi2O6
NaSodium
Naⓘ MerrilliteCa9NaMg(PO4)7
MgMagnesium
Mgⓘ SpinelMgAl2O4
Mgⓘ MerrilliteCa9NaMg(PO4)7
Mgⓘ Fayalite-Forsterite Series
AlAluminium
Alⓘ SpinelMgAl2O4
SiSilicon
Siⓘ Fayalite-Forsterite Series
Siⓘ Pyroxene GroupADSi2O6
PPhosphorus
Pⓘ MerrilliteCa9NaMg(PO4)7
SSulfur
Sⓘ IsocubaniteCuFe2S3
Sⓘ TroiliteFeS
CaCalcium
Caⓘ MerrilliteCa9NaMg(PO4)7
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ Native IronFe
Feⓘ IsocubaniteCuFe2S3
Feⓘ Native Iron var. Kamacite(Fe,Ni)
Feⓘ Taenite(Fe,Ni)
Feⓘ TroiliteFeS
Feⓘ Fayalite-Forsterite Series
Feⓘ Native Iron var. MartensiteFe
NiNickel
Niⓘ Native Iron var. Kamacite(Fe,Ni)
Niⓘ Taenite(Fe,Ni)
CuCopper
Cuⓘ IsocubaniteCuFe2S3

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Farrington, O.C. (1915). Catalogue of the meteorites of North America: Memoirs of the National Academy of Sciences, Vol. 13: Washington. 545 pages.
Prior, G. T. (1923) Catalogue of Meteorites - With Special Reference to those Represented in the Collection of the British Museum (Natural History) (1st ed.) The Trustees of the British Museum, London.
Mason, Brian (1963) Olivine composition in chondrites. Geochimica et Cosmochimica Acta, 27 (10) 1011-1023 doi:10.1016/0016-7037(63)90062-0
Dodd, R. T., Calef, Charles (1971) Twinning and intergrowth of olivine crystals in chondritic meteorites. Mineralogical Magazine, 38 (295) 324-327 doi:10.1180/minmag.1971.038.295.06
Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025
Dodd, R.T. & Jarosewich, E. (1979) Incipient melting in and shock classification of L-Group chondrites: Earth and Planetary Science Letters 44(2): 335-340. (Aug 1979).
Graham, A. L., Bevan, A. W. R., Hutchison, R. (1985) Catalogue of Meteorites - With Special Reference to those Represented in the Collection of the British Museum (Natural History) (4th ed.) British Museum (Natural History), London.
Bennett, M.E. & McSween Jr, H.Y. (1996) Shock feature in iron-nickel metal and troilite of L-group ordinary chondrites Meteoritics & Planetary Science 31(2): 255-26. (March 1996).
www.psrd.hawaii.edu (n.d.) http://www.psrd.hawaii.edu/April04/asteroidHeating.html
Alwmark, C., Schmitz, B., Holm, S., Marone, F. & Stamponi, M. (2011) A 3-D study of mineral inclusions in chromite from ordinary chondrites using synchrotron radiation X-ray tomographic microscopy—Method and application: Meteoritics & Planetary Science 46 (8): 1071–1081. (Aug 2011).
www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php?code=15463
www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5630728
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