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RE: etch hex.

Once I had the opportunity to etch slabs of Campo del Cielo, Canyon Diablo,
Odessa, Needles (fine), and Red Rock(CA) (medium), all with the same etch
solution.  It was quite remarkable the variation in the rate and degree of
etch among these octahedrite specimens.  The same solution that barely
produced a faint frost on the Campo (even after 20 minutes!), turned the
schreibersite in my Odessa a golden color (after only 7 minutes).

Please read about O. R. Norton and Ron Oriti's experience about etching
hexahedrites in his "Rocks from Space" (pg 218, I think).  Then check to see
if those "fractures" aren't really Neumann lines.

Bob V.

P.S. - Some on the List may remember my post a few months back about
preventing RUST by "preserving my Campo's in (anhydrous) alcohol.  Large
ones in paint cans, and small pieces in specimen jars.  Well, I'm happy to
report that all specimens, including the ETCHED ones, have remain UNCHANGED.
More about this later.

Then again, there was that Odessa specimen of mine that wasn't completely
submerged under alcohol.  It wasn't a pretty sight.  Very Important - irons
MUST be completely submerged!


-----Original Message-----
From: harlan trammell [mailto:skyrox@hotmail.com]
Sent: Wednesday, March 31, 1999 2:33 PM
To: meteorite-list@meteoritecentral.com
Subject: etch hex.


tried to etch 2 hexahedrites(smithsonia, gressek) but the never produced 
a pattern even though you could see fractures along clevage planes. 
etched an octahedrite(trenton)for test-solution was good the mirror 
finish just turned frosty and the troilite darkened, but no pattern 
showed up after rigorous tries. anybody got any ideas why the hex. did 
not etch?
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