[meteorite-list] Interesting Cohenite feature

[bernd.pauli at paulinet.de]

Martin wrote:

I found a very useful and ineresting picture in one of Marcin's auctions.

http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=110143358121

Note the left lower side of the etched surface. It's full of cohen-
ite worms and note how limited the cohenite is to only this area.


Hello Listees and Listoids,

Cohenite = [(Fe,Ni,Co)3C]

Buchwald writes about Morasko:

Cohenite is common in some sections, absent in others ... Over an area of
4 x 3 cm^2, a total of 45 cohenite crystals, each typically 3 x 0.6 mm in size,
was observed. They formed rounded bodies with reentrant angles and with
50-300 µ inclusions of kamacite, taenite and schreibersite.

Buchwald about cohenite:

Buchwald V.F. (1975) Handbook of Iron Meteorites, Vol. 1, Cohenite (p. 100):

- cohenite is brilliant  w h i t e
- it is very hard, significantly harder than schreibersite
- characteristic of group I irons (also occurs in other irons)

Reference:

BUCHWALD V.F. (1975) Handbook of Iron Meteorites, Vol. 3, pp. 836-838.


Best wishes,

Bernd