[Rockhounds] Oregon Unknown Now Known

[Jay Bates]

Gentlemen, gentlemen and ladies, this nondescript entity hiding in a 
cloak of respectability called Kenny has been an embarrassment to us all 
and needs to be dealt with accordingly, or as they say in the street 
lingo of gangs in LA, we need to wipe the books clear.   I think it is 
John's duty to do the deed and send Kenny hurtling into a diamond saw or 
at very least, to bury him in the bottom of one his interminable piles 
of  nondescript rock never again to see the light of day. {:-!

Tim wrote:
> That's correct, Pete. Also, the matrix of thundereggs that have been
> analyzed shows up as about 75% cristobalite, but it's definitely what you
> describe as a fibrous form of several minerals. And as I recall, the black
> "perlite" that overlies most thunderegg strata has also tested out as mostly
> cristobalite. 
>
>
> Tim Fisher 
> Ore-ROCK-On! 
> Email address at http://OreRockOn.com
>
>
> -----Original Message-----
> From: rockhounds-bounces at lists.drizzle.com
> [mailto:rockhounds-bounces at lists.drizzle.com] On Behalf Of pmodreski at aol.com
> Sent: Monday, February 23, 2009 12:35 PM
> To: rockhounds at lists.drizzle.com
> Subject: Re: [Rockhounds] Oregon Unknown Now Known
>
> Thanks for reporting the info, John.
>
> And now, do we (or I should just say, do I) remember, exactly which specimen
> this was?? I think it was the one originally described as the "Oregon
> oolitic", right?? (My copy of your original post with link to a photo, has
> evidently since disappeared into the oblivion of my aol inbox's
> automatically-after-30-days deleted email.)
>
> A comment,?the white globular spherulites-formed-by-devitrification often
> seen on specimens of obsidian, are often labelled as "cristobalite".? My
> belief, from what I've read and from having X-rayed a couple such things
> myself over the years, are that they are probably rarely or never pure
> cristobalite, but rather are fine-grained, fibrous intergrowths of several
> minerals that form by divitrification of the obsidian, namely as with this
> one, cristobalite + sanidine +/- other feldspar minerals (e.g., the
> anorthoclase).
>
> Pete
>
>
> -----Original Message-----
> From: John Siebel <john at pandemoniumgraphics.com>
> To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> <rockhounds at lists.drizzle.com>
> Sent: Mon, 23 Feb 2009 1:09 pm
> Subject: [Rockhounds] Oregon Unknown Now Known
>
>
> This from Jim Murowchick. Thanks Jim!?
> ?
> Hi John-?
> ? I received your sample just before lunch today, so I ran an X-ray pattern
> while I was at lunch, and I have the results.?
> ?
> The envelope, please... (drum roll)...64% cristobalite (SiO2), 26%
> anorthoclase ((Na,K)AlSi3O8), and 10% sanidine (KAlSi3O8). Hematite (Fe2O3)
> is probably present as a pigment.?
> ?
> I don't remember if anyone was close in their proposed IDs-just goes to show
> how difficult it is to ID something from a photo.?
> The variable hardness you reported might be due to either that you were
> measuring the hardness of an aggregate, and not a single crystal, or that
> parts of the sample might be altered, though I didn't see evidence of any
> common alteration products of the feldspars.?
> ?
> I'll leave it to you to announce the results to the Rockhounds list.?
> ?
> Thanks for the fun.?
> ?
> Jim?
> ?
> Dr. James B. Murowchick?
> Associate Professor, Geochemistry and Mineralogy?
> Department of Geosciences?
> University of Missouri-Kansas City?
> 5110 Rockhill Road / 420 Flarsheim Hall?
> Kansas City, MO 64110?
> 816 235-2979 murowchickj at umkc.edu?
> ?
> ?
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