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Haxtun meteorite, Phillips Co., Colorado, USA

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Latitude & Longitude (WGS84): 40° 27' 24'' North , 102° 34' 41'' West
Latitude & Longitude (decimal): 40.4566666667, -102.578333333
Erratic type:Meteorite

Ordinary Chondrite (H/L4; S3; W4)
Find,1975; 15.5 kg, single stone

A weathered stone was found in a wheat field. Well-defined chondrules, mostly barred olivine (BO) with smaller amounts of pyroxene-rich types (PO, POP, RP), are intergrown within a dark, fine-grained matrix. Very nearly equilibrated olivine (Fa21.6) and orthopyroxene (Fs17.8) are accompanied by Fe-Ni metal and troilite. The Fe-Ni metal and troilite are frequently founds as irregular aggregates near chondrule rims. Minor amounts of plagioclase and chromite are also reported. Total Fe (~21 wt%) as well as silicate composition indicate an H/L chondrite. Mosaicism in olivine is indicative of significant pre-terrestrial shock (level S3). Iron oxides at the rims of metal grains and as narrow veins are indicative of significant terrestrial weathering (level W4).

The H/L ordinary chondrites — chondrites with intermediate compositions relative to the much larger H and L geochemical groups — represent a very small portion of the ordinary chondrite flux. Only 4 witnesses LL falls are know — less than 0.5% of all witnessed falls. The H/L4 petrologic type is small indeed — only one H/L4 fall is known (Cali) while Haxtun itself, a meteorite of rather modest mass, contains more mass than all the other H/L4 meteorites combined.

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4 valid minerals.

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Wlotzka, F. (1993). The Meteoritical Bulletin, No. 75. Meteoritics 28(5): 692-703. (Dec 1993).

Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.

Wlotzka, F. (2005) Cr spinel and chromite as petrogenetic indictors in ordinary chondrites: Equilibrium temperatures of petrologic type 3.7 to 6. Meteoritics & Planetary Science 40 (11): 1673-1702. (Nov 2005).

Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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