[meteorite-list] Is This All Olivine

From: David Freeman <dfreeman_at_meteoritecentral.com>
Date: Thu Apr 22 09:54:05 2004
Message-ID: <3C6DAAFC.70801_at_fascination.com>

Dear Mark,
Only the gem variety is called peridot.
Dave F.

Mark Miconi wrote:

>Wouldn't/isn't terrestrial Olivine called Peridot anyway?
>
>Mark
>----- Original Message -----
>From: Dave Mouat <dmouat_at_dri.edu>
>To: DiamondMeteor <DiamondMeteor_at_hotmail.com>
>Cc: meteorite-list <meteorite-list_at_meteoritecentral.com>
>Sent: Friday, February 15, 2002 10:42 AM
>Subject: Re: [meteorite-list] Is This All Olivine
>
>
>>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
>>>----------------------------------------------------------------------
>>>http://pages.britishlibrary.net/mhy10/meteor/index.html
>>>===============================================
>>>"As vision grows expression becomes difficult.", AnNiffari
>>>
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>>
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>
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Received on Fri 15 Feb 2002 07:42:36 PM PST