[meteorite-list] Slickensides vs. Shock Veins correction Ringwoodite

From: Mr EMan <mstreman53_at_meteoritecentral.com>
Date: Thu, 4 Oct 2007 02:35:55 -0700 (PDT)
Message-ID: <483617.85109.qm_at_web51007.mail.re2.yahoo.com>

I am so sorry Mia Culpa!

 I was covering writing several articles tonight and
had a computer glitch along with a brain freeze.
I lost something in the process. What I should have
said was:

"Ringwoodite" a mineral and is the spinel polymorph of
olivine.

"Maskelynite" is not a mineral but a glass derived
from feldspars that have been shock melted.

"Smectite" also not a mineral, is a broad term
covering the mostly clay substance (e.g feldspar
weathering products)in terrestrial slickensides.

I suspect that the material in slickensides from
meteorites will also fall under the classification
smectite.

Thanks for paying attention!

Elton
--- dellenit at aon.at wrote:

> Hi Elton,
>
> you are right with the slickensides. But some
> comments on Maskelynite:
> It is NOT from olivine ! it is a glassy mineral
> which has a composition of plagioclase feldspar. It
> results from quenching from shock induced melt !
> ref:
>
http://www.lpi.usra.edu/meetings/metsoc99/pdf/5047.pdf
>
> Harald
Received on Thu 04 Oct 2007 05:35:55 AM PDT