[meteorite-list] primitive Ureilite ?

[stan .]

Just out of curiosity, do you know the subtype of this ureilite yet, or does 
the diffrences between it and other ureilites make it not fit in with any 
subtype?



>From: "Adam Hupe" <raremeteorites at comcast.net>
>To: <meteorite-list at meteoritecentral.com>
>Subject: Re: [meteorite-list] primitive Ureilite ?
>Date: Tue, 28 Sep 2004 10:26:50 -0700
>
>Hi List,
>
>Matt is correct in stating that all Ureilites are primitive.  The reason I
>used the word primitive in describing NWA 3140 is that it is less evolved
>than that of other Ureilites.  It even has areas containing elemental 
>metal,
>no differentiation between crystals/matrix  and is relatively diamond poor.
>I enjoy Ureilites when prepared properly (by somebody else) because they 
>are
>striking under magnification.  I do not enjoy preparing them myself because
>it usually takes 30 times the effort to do it right because of the 
>diamonds.
>NWA 3140 does not destroy blades and polishing pads during preparation
>making it a pleasure to work with.  In the past we worked with a
>diamond-rich Ureilite called NWA 3135.  To make a 2.8 centimeter cut cost 
>us
>3 blades, 2 diamond lap wheels and over 3 hours of effort making it a true
>nightmare.
>
>All the best,
>
>------------------------------------
>Adam Hupe
>The Hupe Collection
>Team LunarRock
>IMCA 2185
>raremeteorites at comcast.net
>
>
>
>----- Original Message -----
>From: "Matt Morgan" <mmorgan at mhmeteorites.com>
>To: <j.divelbiss at att.net>
>Cc: <meteorite-list at meteoritecentral.com>
>Sent: Tuesday, September 28, 2004 9:59 AM
>Subject: RE: [meteorite-list] primitive Ureilite ?
>
>
>John:
>I am sure Adam will have something to add but here is a good description
>of Ureilites
>http://www.daviddarling.info/encyclopedia/U/ureilite.html
>
>I always thought that all ureilites were "primitive".  So someone please
>enlighten us!
>Matt Morgan
>
>-----Original Message-----
>From: meteorite-list-bounces at meteoritecentral.com
>[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of
>j.divelbiss at att.net
>Sent: Tuesday, September 28, 2004 10:51 AM
>To: meteorite-list at meteoritecentral.com
>Subject: [meteorite-list] primitive Ureilite ?
>
>
>Hello all,
>
>I was reading one of Adam's auctions this morning and noticed the word
>primitive attached to the word Ureilite and began to wonder what was the
>latest status on Ureilites being considered "primitive". I know the word
>is used with primitive materials like Acapulcoites and Lodranites
>because their age is suggested at the chondrite level of 4.5+ billion
>years.
>
>I believe this reference for Ureilites infers the involvement of
>pre-solar or solar parts such as the diamonds versus a formation age of
>4.5 billion years. Or maybe I'm wrong about that. At one time the
>diamonds were thought to be shock/pressure related, but recently
>Ureilites with low-shock values have been found that has scientists
>thinking that the diamonds came from some other source.
>
>What is considered the formation age of Ureilites?  And does that age in
>itself make them primitive, or does the parts/pieces make them
>considered primitive?
>
>Curious,
>
>John/JD
>
>
>
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