[meteorite-list] Chondrites and Widmannstatten Pattern

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:01:34 2004
Message-ID: <3D0E42FB.A13C2C08_at_lehrer.uni-karlsruhe.de>

EL Jones wrote:

> The questions now beg... What just exactly are the Nickel-Iron metallic
> particles in chondrites...are they taenite or kamacite? or both? What
> porportions are found in each class of chondrite? etc. Has anyone
> researched and published on this?


Hello Elton and List,

The answer is "both". One of several examples: Tuxtuac

GRAHAM A.L. et al. (1988) The Tuxtuac, Mexico, meteorite,
an LL5 chondrite fall (Meteoritics 23-4, 1988, 321-323):

TABLE 3. Composition of metal phases in Tuxtuac (weight %).

       Kamacite Taenite range tetrataenite range
Fe 59.9 48.8 47-52
Ni 5.7-6.4 38.3 37-41 49.9 47-52
Co 6-7 1.79 1.4-2.0 1.06 0.8-1.4
Total 99.9 (9) 99.7 (6)


Cheers,

Bernd
Received on Mon 17 Jun 2002 04:13:47 PM PDT