[meteorite-list] primitive Ureilite ?

[j.divelbiss at att.net]

Matt,

For some reason I never thought of a Ureilite as primitive per say. Maybe it is just me. :)
Exposing ignorance is a way of life for some...like myself.

Thanx,

John



-------------- Original message from "Matt Morgan" : -------------- 

> 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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