[meteorite-list] Is This All Olivine

From: Dave Mouat <dmouat_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:05 2004
Message-ID: <3C6D48A1.2B2AFCE1_at_dri.edu>

Mohamed
I'm not sure what you mean by the word "large" as in "Olivine is rarely found in
large sizes" but in ultramafic rock exposures (some classic localities in Oman,
by the way) we can find pure unserpentinized olivine in masses the size of the
Hoba meteorite (60 tons) and larger. We find entire mountains of serpentinized
to somewhat serpentinized olivine. So, the presence of olivine would not be
diagnostic of a meteoritic origin. Isotopic (and other chemical) analyses would
be diagnostic.
Dave

DiamondMeteor wrote:

> Dear List;
> I found few rocks that look all composed of Olivine,, and I have read before
> that Olivine is rarely found in large sizes. I have measured its specific
> gravity and found it to be around 3.3 (Olivine: 3.2), its hardness and also
> its color is close to Olivine.
> Some rocks have very thin fusion crust.
> Please have a look,, and I would be delighted to hear your openion.
> http://pages.britishlibrary.net/mhy10/meteor/olv.htm
>
> Best Regards
> Mohamed
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Received on Fri 15 Feb 2002 12:42:57 PM PST