Fremont Butte meteorite, Washington County, Colorado, USA i
Regional Level Types
Fremont Butte meteorite Meteorite Fall Location
Washington County County
Colorado State
USA Country

Ordinary chondrite, brecciated (L4,br)
Find, 1940?; 6.65 kg

In 1963 a Mr. W. R. Barton noticed an ugly, rusted stone which had been on the farm for years and placed it in his wife's rock garden — trying to play a prank on her because of her great interest in the recent sale of the Akron (1961) chondrite. Mrs. Barton said nothing, but sent a small sample to Glen I. Huss for identification. The prankster had inadvertently outfoxed himself.

The stone roughly resembles an elongated, flat-top pyramid with a base measuring 25.7 cm in its longest dimension. Only portions of the original fusion crust remain. One slightly concave side exhibits moderately well developed pits. No flight markings are present. The meteorite is greatly weathered, but its dominant phases are (or once were) olivine, pyroxene, Fe-Ni metal and troilite. Minor chromite, secondary pentlandite, and limonite are also present. Olivine composition (Fa23) and total iron content (Fe ~20.6 wt%) are characteristic of L chondrites. Olivine is abundant as larger fractured crystals, in chondrules, and in ground mass. Chondrules, usually metal-free, are prominent and distinct with radial pyroxene (RP) textures most common. Chondrule sizes are in the 0.4 mm - 4 mm diameter range. Within less weathered regions kamacite and taenite are usually intergrown. Devitrified olivine is indicative of previous shock and subsequent metamorphism.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ Chromite

ⓘ 'Fayalite-Forsterite Series'

ⓘ 'Orthopyroxene Subgroup'

ⓘ Pentlandite

ⓘ Taenite

ⓘ Troilite

6 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

ⓘ L4 chondrite meteorite

Detailed Mineral List:

ⓘ Chromite

Formula: Fe²⁺Cr³⁺₂O₄

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

ⓘ 'Fayalite-Forsterite Series'

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ 'Limonite'

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

ⓘ Native Iron

Formula: Fe

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ Native Iron var. Kamacite

Formula: (Fe,Ni)

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

ⓘ 'Orthopyroxene Subgroup'

Description: Orthopyroxene [variety, Hypersthene].

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ Pentlandite

Formula: (Ni_xFe_y)_Σ9S₈

Description: A terrestrial alteration product.

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ Taenite

Formula: (Fe,Ni)

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

ⓘ Troilite

Formula: FeS

References:

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

Ramdohr, Paul (1972) The Opaque Minerals in Stony Meteorites. De Gruyter. doi:10.1515/9783112651025

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Iron	1.AE.05	Fe
ⓘ	var. Kamacite	1.AE.05	(Fe,Ni)
ⓘ	Taenite	1.AE.10	(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
ⓘ	Pentlandite	2.BB.15	(Ni_xFe_y)_Σ9S₈
ⓘ	Troilite	2.CC.10	FeS
Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
Unclassified
ⓘ	'Limonite'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Orthopyroxene Subgroup'	-

List of minerals for each chemical element

O	Oxygen
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Fayalite-Forsterite Series
Mg	Magnesium
Mg	ⓘ Fayalite-Forsterite Series
Si	Silicon
Si	ⓘ Fayalite-Forsterite Series
S	Sulfur
S	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
S	ⓘ Troilite	FeS
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Cr	Chromium
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Native Iron	Fe
Fe	ⓘ Native Iron var. Kamacite	(Fe,Ni)
Fe	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Fe	ⓘ Taenite	(Fe,Ni)
Fe	ⓘ Troilite	FeS
Fe	ⓘ Fayalite-Forsterite Series
Ni	Nickel
Ni	ⓘ Native Iron var. Kamacite	(Fe,Ni)
Ni	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Ni	ⓘ Taenite	(Fe,Ni)

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Denver BasinBasin
Great Plains DomainDomain
Yavapai TerraneVolcanic Arc

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References

www.lpi.usra.edu (n.d.) http://www.lpi.usra.edu/meteor/metbull.php?code=10181

www.encyclopedia-of-meteorites.com (n.d.) http://www.encyclopedia-of-meteorites.com/test/FremontButte_don_edwards.jpg

articles.adsabs.harvard.edu (n.d.) http://articles.adsabs.harvard.edu/full/1966Metic..3..73H

Huss, G.I., Moore, C.B. & Busek, P.R. (1966) The Fremont Butte, Washington Co., Colorado, Meteorite: Meteoritics 3(2): 73-78. (Nov 1966).

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.

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Detailed Mineral List:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

References

Fremont Butte meteorite, Washington County, Colorado, USA i
Regional Level Types
Fremont Butte meteorite Meteorite Fall Location
Washington County County
Colorado State
USA Country