Estacado meteorite, Hale Co., Texas, USA
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Latitude & Longitude (WGS84): | 33° 53' 59'' North , 101° 45' 0'' West |
---|---|
Latitude & Longitude (decimal): | 33.90000,-101.75000 |
Non-native locality type: | Meteorite |
Meteorite Class: | H6 chondrite meteorite |
Meteoritical Society Class: | H6 |
Metbull: | View entry in Meteoritical Bulletin Database |
Köppen climate type: | BSk : Cold semi-arid (steppe) climate |
Ordinary chondrite (H6)
Found, 1883; 290 kg
A large and weathered chondritic meteorite was found near the Estacado Quaker settlement in Hale County, Texas. The meteorite is compositionally dominated by olivine and orthopyroxene with accompanying minor albitic plagioclase, Fe-Ni metal, and troilite. Small and poorly defined chondrules are present, but sparse in this well-equilibrated stone characterized by small 'xenomorphic' aggregates (Mason and Wiik, 1963). Accessory chromite, phosphates, and opaques are also found in small or tiny quantities. Secondary phases due to terrestrial weathering include pentlandite and limonite.
Estacado is currently (2016) the 8th most massive member of the H group of ordinary chondrites (ordinary chondrites relatively low in total iron). H chondrites, the second largest group of meteorites, account for a little more than 30% of all witnessed meteorite falls. Two major portions of the meteorite (both >100 kg) were obtained by the Field Museum of Natural History in Chicago and the American Museum of Natural History in New York.
Mineral List
15 valid minerals.
Meteorite/Rock Types Recorded
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References
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Mason, B. & Wiik, H.B. (1963) The Composition of the Richardton, Estacado, and Knyahinya Meteorites. American Museum Novitates, No.2154, New York. 18 pp. (Sept 1963).
van Schmus, W.R. & Koffman, D.M. (1967) Equilibration Temperatures of Iron and Magnesium in Chondritic Meteorites: Science, New Series 155 (3765): 1009-1011. (Feb 1967).
Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.
Crozaz, G. & 6 others (1989) Plutonium, uranium and rare earths in the phosphates of ordinary chondrites—the quest for a chronometer: Earth and Planetary Science Letters 93 (2): 157-169.
Reisener, R.J. & Goldstein, J.I. (2003) Ordinary chondrite metallography: Part 2 Formation of zoned and unzoned metal particles in relatively unshocked H, L, and LL chondrites. Meteoritics & Planetary Science 38(11):1679-1696. (Dec 2003).
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Jones, R.H. & McCubbin, F.M. (2012) Phosphate mineralogy and the bulk chlorine / fluorine ratio of ordinary chondrites. 43rd Lunar and Planetary Science Conference: 2029.pdf.
External Links
http://www.lpi.usra.edu/meteor/metbull.php - MeteoriticalBulletinDatabase
http://www.lpi.usra.edu/meteor/metbull.php?code=10057 -Metname@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629623 -Slice of Estacado
http://www.lpi.usra.edu/meteor/metbull.php?code=10057 -Metname@MetBullDatabase
http://www.lpi.usra.edu/meteor/get_original_photo.php?recno=5629623 -Slice of Estacado