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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.
15 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 TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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.
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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.