[meteorite-list] Near pure Olivine Meteorite

From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Wed, 15 Jan 2014 11:11:37 -0500
Message-ID: <CAKBPJW-atnmK9h78Bbba6sBd6cdPoj+h2760Mc8AegY9bFEm1w_at_mail.gmail.com>

Hi Greg and List,

Lava bombs are beautiful if prepared properly. I had some a couple of
years ago. I sliced them thinly and polished them. They were
translucent and very pretty when backlit. Of course, the material was
friable and more than one slice broke during preparation. But it was
worth the trouble.

Best regards and Happy Huntings,

MikeG


On 1/15/14, Greg Hup? <gmhupe at centurylink.net> wrote:
> Hi Jim,
>
> Here is a good read about a volcanic maar crater in New Mexico that
> deposited peridotite/olivine bearing lava 'bombs' with crustal/mantle
> xenoliths. It is a great site to visit, went there in 2007 with a group of
> friends and collected many specimens.
> http://geoinfo.nmt.edu/tour/landmarks/kilbourne_hole/home.html
>
> Best Regards,
> Greg
>
> ====================
> Greg Hup?
> The Hup? Collection
> gmhupe at centurylink.net
> www.NaturesVault.net (Online Catalog & Reference Site)
> www.LunarRock.com (Online Planetary Meteorite Site)
> NaturesVault (Facebook, Pinterest & eBay)
> http://www.facebook.com/NaturesVault
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>
>
> -----Original Message-----
> From: Jim Wooddell
> Sent: Wednesday, January 15, 2014 10:16 AM
> To: meteorite-list at meteoritecentral.com
> Subject: Re: [meteorite-list] Near pure Olivine Meteorite
>
> Thank you all for your comments!
>
> I am not sure either that ablation would be a huge factor in why we are
> not finding olivine meteorites. The mean melting is about 3100 degrees
> F (Fo = ~3450F, Fs =~2752), I think. I suppose, if I look at the
> earth's mantle, olivine is a primary mineral but even then, I do not
> find large chunks just laying around waiting to be found. My thinking
> is that if it is such a primary mineral, we should see more, not knowing
> the factors that completely effect it.
>
> Jim
>
>
>
> On 1/14/2014 10:25 PM, Alan Rubin wrote:
>> Iron meteorites tend to break up in the atmosphere at lower depths than
>> stony meteorites, so I suppose that pallasites would also be better able
>> to survive transit through the Earth's atmosphere than dunites. But I am
>>
>> guessing that very few dunites ever make it to the top of the Earth's
>> atmosphere to begin with.
>>
>>
>> Alan Rubin
>> Institute of Geophysics and Planetary Physics
>> University of California
>> 3845 Slichter Hall
>> 603 Charles Young Dr. E
>> Los Angeles, CA 90095-1567
>> phone: 310-825-3202
>> e-mail: aerubin at ucla.edu
>> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>>
>>
>> ----- Original Message ----- From: <pshugar at messengersfromthecosmos.com>
>> To: "Alan Rubin" <aerubin at ucla.edu>; "Jim Wooddell"
>> <jim.wooddell at suddenlink.net>; <meteorite-list at meteoritecentral.com>
>> Sent: Tuesday, January 14, 2014 5:27 PM
>> Subject: RE: [meteorite-list] Near pure Olivine Meteorite
>>
>>
>> Would they also melt or more correctly ablate off material faster and
>> more completely
>> upon entering the earth's atmosphere?
>> Pete
>>
>>
>>> -------- Original Message --------
>>> Subject: Re: [meteorite-list] Near pure Olivine Meteorite
>>> From: "Alan Rubin" <aerubin at ucla.edu>
>>> Date: Tue, January 14, 2014 6:54 pm
>>> To: "Jim Wooddell" <jim.wooddell at suddenlink.net>,
>>> <meteorite-list at meteoritecentral.com>
>>>
>>>
>>> The question of the dearth of olivine meteorites (asteroidal dunites)
>>> has
>>> been around for a very long time. Most folks have ascribed this paucity
>>>
>>> as
>>> being due to the brittle nature of olivine meteorites relative to
>>> pallasites. Pallasites have relatively long cosmic-ray-exposure ages
>>> indicating that they can survive the rigors of interplanetary space for
>>> a
>>> rather long while. Eucrites have much shorter CRE ages on average.
>>> This
>>> suggests that if asteroidal dunites are from deep in the mantle, they
>>> would
>>> be in space about as long as the pallasites and not survive because they
>>>
>>> are
>>> no tougher than eucrites.
>>> Alan
>>>
>>>
>>> Alan Rubin
>>> Institute of Geophysics and Planetary Physics
>>> University of California
>>> 3845 Slichter Hall
>>> 603 Charles Young Dr. E
>>> Los Angeles, CA 90095-1567
>>> phone: 310-825-3202
>>> e-mail: aerubin at ucla.edu
>>> website: http://cosmochemists.igpp.ucla.edu/Rubin.html
>>>
>>>
>>> ----- Original Message ----- From: "Jim Wooddell"
>>> <jim.wooddell at suddenlink.net>
>>> To: <meteorite-list at meteoritecentral.com>
>>> Sent: Tuesday, January 14, 2014 4:05 PM
>>> Subject: [meteorite-list] Near pure Olivine Meteorite
>>>
>>> > ______________________________________________ -----
>> No virus found in this message.
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>> Version: 2014.0.4259 / Virus Database: 3658/7003 - Release Date: 01/14/14
>>
>>
>
>
> --
> Jim Wooddell
> jim.wooddell at suddenlink.net
> http://pages.suddenlink.net/chondrule/
>
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Received on Wed 15 Jan 2014 11:11:37 AM PST