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Rosebud meteorite, Milam Co., Texas, USA

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Latitude & Longitude (WGS84): 30° 49' North , 97° 3' West
Latitude & Longitude (decimal): 30.81667,-97.05000
GeoHash:G#: 9v6zrd425
Locality type:Meteorite Fall Location
Meteorite Class:H5 chondrite meteorite
Meteoritical Society Class:H5
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:Cfa : Humid subtropical climate


Ordinary chondrite, blackened (H5)
Find, pre-1915; 54.9 kg

The Rosebud meteorite was recovered as a conical-shaped mass. ~10 km south of Rosebud in neighboring Milam County. It had been known for at least several years before 1915 when it was presented to the University of Texas. Its original mass was 54.9 kg. Olivine (> 50 vol%) is dominant — in chondrules as both euhedral and fragmented crystals and also in matrix. Orthopyroxene and lesser amounts of maskelynite are also present. Chondrules are texturally diverse. Fe-Ni metal is concentrated within the matrix, but much of the metal (esp. kamacite) has weathered away. Troilite, also partially weathered away, is irregularly scattered thruout the meteorite. Small amounts of accessory chromite in small grains are present. Hydrous iron oxides are present as reddish stains and are concentrated along veins & cracks.

The main mass is with the University of Texas at Austin.

Synonym: 'Glen Rose (stone).'

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 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:

'Albite-Anorthite Series'
Description: Plagioclase (of oligoclase composition) present in small grains.
Reference: Ehlmann, A.J. & Keil, K. (1987) Classification of a second group of ordinary chondrites from Texas: Meteoritics 22 (1): 17-23. (March 1987).
Chromite
Formula: Fe2+Cr3+2O4
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
'Fayalite-Forsterite Series'
Description: Olivine composition (Fa19), Mason,1963.
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).; Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).; Ehlmann, A.J. & Keil, K. (1987) Classification of a second group of ordinary chondrites from Texas: Meteoritics 22 (1): 17-23. (March 1987).
'H5 chondrite meteorite'
Reference: Meteoritical Society Database
Ilmenite
Formula: Fe2+TiO3
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Iron
Formula: Fe
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
'Limonite'
Formula: (Fe,O,OH,H2O)
Description: Hydrous iron oxides are present as reddish stains and are concentrated along veins & cracks.
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.; Ehlmann, A.J. & Keil, K. (1987) Classification of a second group of ordinary chondrites from Texas: Meteoritics 22 (1): 17-23. (March 1987).
'Maskelynite'
Description: Most or all of the glass is of feldspathic composition.
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).
'Orthopyroxene Subgroup'
Description: Original classification label, Olivine-bronzite chondrite.
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).; Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Taenite
Formula: (Fe,Ni)
Reference: Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Troilite
Formula: FeS
Reference: Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).; Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.; Ehlmann, A.J. & Keil, K. (1987) Classification of a second group of ordinary chondrites from Texas: Meteoritics 22 (1): 17-23. (March 1987).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Iron'1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Taenite1.AE.10(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
'Chromite'4.BB.05Fe2+Cr3+2O4
'Ilmenite'4.CB.05Fe2+TiO3
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'H5 chondrite meteorite'-
Limonite-(Fe,O,OH,H2O)
Maskelynite-
Orthopyroxene Subgroup-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Taenite1.1.11.2(Fe,Ni)
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'H5 chondrite meteorite'-
Iron-Fe
'Limonite'-(Fe,O,OH,H2O)
'Maskelynite'-
'Orthopyroxene Subgroup'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O ChromiteFe2+Cr23+O4
O IlmeniteFe2+TiO3
O Limonite(Fe,O,OH,H2O)
SSulfur
S TroiliteFeS
TiTitanium
Ti IlmeniteFe2+TiO3
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe ChromiteFe2+Cr23+O4
Fe IlmeniteFe2+TiO3
Fe IronFe
Fe Iron (var: Kamacite)(Fe,Ni)
Fe Limonite(Fe,O,OH,H2O)
Fe Taenite(Fe,Ni)
Fe TroiliteFeS
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)
Ni Taenite(Fe,Ni)

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

Eocene - Paleocene
33.9 - 66 Ma



ID: 2937998
Midway Group, undivided

Age: Paleogene (33.9 - 66 Ma)

Stratigraphic Name: Wills Point Formation; Kincaid Formation

Description: clay, silty, sandy, sl. glauconitic, massive, poorly bedded, grades up to mudst. and sand of Wilcox Group; thickness 500 +-ft. Kincaid Fm- upper part (Pisgah Member) sand and clay; sand, glauconitic, poorly sorted, clayey; clay, sandy, silty, med. gray to black; lower part (Littig Member) sand and clay; sand v. glauconitic, greenish black; clay sandy, phosphatic nodules and pebbles; thickness 150 +-ft. In East Texas and Gulf Coast to Rio Grande: clay, sand, limestone, and marl 500-650 ft thick

Comments: Original map source: Stoeser, Douglas B., Shock, Nancy, Green, Gregory N., Dumonceaux, Gayle M., and Heran, William D., 2005, Geologic Map Database of Texas, USGS, DS 170, scale 1:500,000.

Lithology: Major:{clay,sand}, Minor:{silt}, Incidental:{limestone, marlstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Cretaceous
100.5 - 145 Ma



ID: 3186170
Mesozoic sedimentary rocks

Age: Early Cretaceous (100.5 - 145 Ma)

Lithology: Carbonate,shale

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)
Bullard, F.M. (1939) The Rosebud meteorite, Milam county, Texas: American Mineralogist 24(4): 242-254. (April 1939).
Mason, B. (1963) Olivine in ordinary chondrites. Geochimica et Cosmochimica Acta 27(9): 1011-1023. (Sept 1963).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Graham, A. L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Ehlmann, A.J. & Keil, K. (1987) Classification of a second group of ordinary chondrites from Texas: Meteoritics 22 (1): 17-23. (March 1987).
Grady, M.M (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

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