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Tazewell meteorite, Claiborne Co., Tennessee, USA

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Iron, finest octahedrite (IAB-SLH, Of) Bandwidth only 0.045mm.
Found in 1853, 27 kg

A meteorite was hit by a plow on a hillside in 1853. Portions of the meteorite were heavily weathered and much of the crust had been weathered away. The first reports by Smith noted the Ni-bearing 'meteoritic' iron, schreibersite, an iron sulfide, and what he labelled a 'protochloride' of iron. More thorough analysis of the less weathered portions have revealed a somewhat unusual iron meteorite with kamacite lamellae, large portions of taenite and plessite (70-90 vol%), accessory schreibersite, troilite, and haxonite with traces of olivine. However, the 'protochloride' was eventually labelled as a new mineral, lawrencite. Lawrencite was subsequently observed in a number of other meteorites — especially in weathered iron and stony iron meteorites. While for several decades there was some controversy about whether the lawrencite was preterrestrial, the more interesting result of these studies is that lawrencite was but the first of several instances of a hitherto unobserved mineral being produced in the unique micro-environments of extraterrestrial matter first encountering the earth's oxygen and water containing atmosphere and surface. (Cf. Buchwald (1975) and Rubin (1975) for more examples.)

Mineral List

8 entries listed. 5 valid minerals. 1 type locality (valid mineral).

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Smith, J. L. (1854) A new meteorite from Tennessee: American Journal of Science and Arts (2nd series). Volume 17: p. 131.

Smith, J. L. (1855) Memoir on Meteorites--A description of five new meteoric irons, with some theoretical considerations on the origin: American Journal of Science and Arts (2nd series). Volume 19: 153-163.

Farrington, O. C. (1915). Meteorites. Self-Published: Chicago. 233 pages.

Buchwald, V. F. (1975) Handbook of Iron Meteorites. University of California Press. 1418 pages.

Rubin, A. E. (1997) Mineralogy of Mineral Groups: Meteoritics & Planetary Science 32(2): 231-247. (March 1997)

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