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Etter meteorite, Moore Co., Texas, USA

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Latitude & Longitude (WGS84): 35° 58' 60'' North , 101° 53' 60'' West
Latitude & Longitude (decimal): 35.98333,-101.90000
Non-native locality type:Meteorite
Meteorite Class:L5 chondrite meteorite
Meteoritical Society Class: L5
Metbull:View entry in Meteoritical Bulletin Database
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Ordinary chondrite, highly shocked & weathered (L5; S5; W4)
Found, 1965; 400 kg

Several very weathered stones had been plowed up on neighboring farms and were recognized as meteorites in 1966 (mass ~150 kg). Even larger masses of additional stones have been recovered in recent decades. Within the meteorite poorly defined chondrules are intergrown with the recrystallized matrix. Chondrule textures are predominantly porphyritic olivine-and-pyroxene-rich (PO, POP) and barred olivine (BO) [apparent diameters 0.3 mm — 1 mm]. Minor augite and plagioclase aggregates are also present. Compositionally, total iron content (~20 wt%) and equilibrated olivine (Fa25) compositions are characteristic of the L group of ordinary chondrites. Mineralogically, olivine (~50 vol%) and Ca-poor pyroxene (~25 vol%) account for approximately 3/4 of the meteorite's volume. Albitic plagioclase, troilite, and augite account for another (~20 vol%) of the meteorite. The original Fe-Ni metal content is rather uncertain as much of the iron has either been converted into hydrous iron oxides or lost to weathering. Much of the remaining Fe-Ni metal is present as small blebs within the matrix. Accessory chromite and minor silicates are also reported. Fracturing and undulose extinction of olivine and pyroxene indicate a high degree of shock (level S5 include). Veins and patches of hydrous iron oxides indicative of signifiant weathering are apparent.

Etter has an unusually low cosmic ray exposure (CRE) age [~1.7 Ma].

The L group (relatively low in total iron) of ordinary chondrites are the largest group of ordinary chondrites and represent ~45% of classified and witnessed falls with L5 representing ~20 % of the total L group. Etter is the 3rd most massive of the 5,000 plus meteorites and meteorite fragments classified exactly as 'L5' chondrites at the Meteoritical Society's Web Page [in May 2016].


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5 valid minerals.

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References

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Clarke Jr, R.S. - Editor (1975). The Meteoritical Bulletin, No. 52. Meteoritics 10(2): 133-158. (June 1975).
Rubin, A.E., Rehfeldt, A., Peterson, E., Keil, K. & Jarosewich, E. (1983) Fragmental Breccias and the collisional evolution of ordinary chondrite parent bodies: Meteoritics 18(3): 179-196. (Sept 1983).
Shimaoka, T. & Nakamura, N. (1989). Vaporization of sodium from a partially molten chondritic material: Proc. NIPR Symp. Antarctic Meteorites 2: 252-267.
Ruzicka, A., Snyder, G.A. & Taylor, L.A. (1997) Large chondrules and lithic clasts in Julesberg (L3) and other ordinary chondrites - Petrographic and mineral-chemical characterization: Lunar and Planetary Science Conference XXVIII: 219-220. (March 1997).
Sato, A., Ninagawa, K. & Hyodo, H. (2000) Cathodoluminescence and Laser Probe Argon-40-Argon-39 Dating of Maskelynite in Ordinary Chondrite, Etter: Meteoritics & Planetary Science 35 (5, Supplement): page. A142. (Sept 2000).
Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Skála, R. & Císařová, I. (2005) Crystal Structure of Troilite from Chondrites Etter and Georgetown (abstract): Lunar and Planetary Science Conference XXXVI, abs. no.1284. (March 2005).
Grady, M. M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pp.

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