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Atwood meteorite, Logan County, Colorado, USAi
Regional Level Types
Atwood meteoriteMeteorite Fall Location
Logan CountyCounty
ColoradoState
USACountry

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Latitude & Longitude (WGS84):
40° 31' North , 103° 16' West
Latitude & Longitude (decimal):
40.51667,-103.26667
GeoHash:
G#: 9xnw6pgd8
GRN:
N28W56
Type:
Meteorite Fall Location
Meteorite Class:
L6 chondrite meteorite
Meteoritical Society Class:
L6
Metbull:
View entry in Meteoritical Bulletin Database
Köppen climate type:
BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Atwood133 (2011)3.5km
Merino283 (2017)8.1km
Sterling14,104 (2017)13.1km
Hillrose250 (2017)30.3km
Iliff259 (2017)31.8km
Mindat Locality ID:
295968
Long-form identifier:
mindat:1:2:295968:2
GUID (UUID V4):
0


Ordinary chondrite (L6)
Find, 1963; 2.1 kg

Three fragments of a single meteoric stone were found. Inspections reveal indistinct chondrules within an equilibrated matrix. Compositionally, equilibrated olivine (Fa25) and low Ca-orthopyroxene ('hypersthene') are characteristic of the L-chondrite geochemical group. Mineralogically, the meteorite consists primarily of dominant olivine plus pyroxene accompanied by minor troilite and Fe-Ni metal. Accessory chromite, copper, ilmenite and minor sulfides are also reported. Goethite, a common meteorite weatherates, was observed in detail in an early use of Mössbauer spectroscopy to study meteorites (Herr & Skerra (1969).

A U-He age of ~1.14 Ga is reported, possibly indicative of a major collision involving an intermediate parent body (IPB) during the last one or two eons.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


8 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
ⓘ Copper
Formula: Cu
ⓘ 'Fayalite-Forsterite Series'
ⓘ Goethite
Formula: Fe3+O(OH)
Description: Early use of Mössbauer Spectroscopy for mineralogical information in meteorites.
ⓘ Ilmenite
Formula: Fe2+TiO3
ⓘ Iron
Formula: Fe
ⓘ Iron var. Kamacite
Formula: (Fe,Ni)
ⓘ Isocubanite
Formula: CuFe2S3
Description: Isocubanite was deemed a primary mineral (pre-terrestrial) by Ramdohr (1973) in a study which relied mostly upon textural characteristics. This might be confirmable by isotopic studies.
ⓘ 'Orthopyroxene Subgroup'
Description: Orthopyroxene composition ('hypersthene') characteristic of L chondrites.
ⓘ 'Plessite'
ⓘ Taenite
Formula: (Fe,Ni)
ⓘ Troilite
Formula: FeS

Gallery:

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
ⓘGoethite4.00.Fe3+O(OH)
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘIlmenite4.CB.05Fe2+TiO3
Unclassified
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Plessite'-
ⓘ'Orthopyroxene Subgroup'-

List of minerals for each chemical element

HHydrogen
Hⓘ GoethiteFe3+O(OH)
OOxygen
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ GoethiteFe3+O(OH)
Oⓘ IlmeniteFe2+TiO3
Oⓘ Fayalite-Forsterite Series
MgMagnesium
Mgⓘ Fayalite-Forsterite Series
SiSilicon
Siⓘ Fayalite-Forsterite Series
SSulfur
Sⓘ IsocubaniteCuFe2S3
Sⓘ TroiliteFeS
TiTitanium
Tiⓘ IlmeniteFe2+TiO3
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ GoethiteFe3+O(OH)
Feⓘ IlmeniteFe2+TiO3
Feⓘ IronFe
Feⓘ IsocubaniteCuFe2S3
Feⓘ Iron var. Kamacite(Fe,Ni)
Feⓘ Taenite(Fe,Ni)
Feⓘ TroiliteFeS
Feⓘ Fayalite-Forsterite Series
NiNickel
Niⓘ Iron var. Kamacite(Fe,Ni)
Niⓘ Taenite(Fe,Ni)
CuCopper
Cuⓘ CopperCu
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

www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php?code=4891
Mason, B. (1967) Olivine composition in chondrites—a supplement: Geochimica et Cosmochimica Acta 31(6):1100-1103. (June 1967).
Taylor, G.J. (1968) On the Thermal History of Chondrites: Master's Thesis: Rice University. 73 pages.
Herr, W. & Skerra, B. (1969) Mössbauer Spectroscopy applied to the classification of stone meteorites. IN: Meteoritic Research: Millman, P.M.-Ed.: pp. 106-122. D. Reidel Publishing Company: Dordrecht-Holland.
Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025
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.
Wasson, John T., Wang, Sichao (1991) The histories of ordinary chondrite parent bodies: U,Th-He age distributions. Meteoritics, 26 (2) 161-167 doi:10.1111/j.1945-5100.1991.tb01033.x
Grady, Monica (2000) Catalogue of Meteorites (5th ed.). Cambridge University Press.
www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php
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