[Rockhounds] when volcanoes drop bombs: giant crystal payload

[Axel Emmermann]

Thank you , Kitty.
I'm , due to other activities, lurking for the time being ;-)))
However, if you want a good laugh just try writing a few paragraphs about
minerals and your mineral club and let your spellchecker do its thing...
Our local obervatory "Urania" is always changed to "urinal" and "MKA-ers"
(Dutch short for MKA-members) become "mackerels".

Axel
 

> -----Oorspronkelijk bericht-----
> Van: rockhounds-bounces at lists.drizzle.com 
> [mailto:rockhounds-bounces at lists.drizzle.com] Namens Kitty & 
> Bill Heacox
> Verzonden: donderdag 2 augustus 2007 0:50
> Aan: Rockhounds at drizzle.com: A mailing list for rock and gem 
> collectors
> Onderwerp: Re: [Rockhounds] when volcanoes drop bombs: giant 
> crystal payload
> 
> Agreed, cool stories.
> 
> BTW, Pete you should override your spellchecker so it will leave Mr. 
> Emmermann's given name as Axel, not Alex!  ;)
> 
> Aloha,Kitty
> 
> At 02:26 AM 8/1/2007, you wrote:
> >Cool stories, Alex and Don, and that's a great photo of the glassy 
> >feldspar crystal in the volcanic bomb from Spencer ID.
> >
> >I should try to guess what it is; I'm torn between guessing 
> orthoclase 
> >or sanidine; I'll go with orthoclase.  Let me know what it 
> turns out to  be.
> >
> >And I hate to sound like the skeptic, but I cannot believe that any  
> >feldspar crystal like this (or the one you describe, Alex) actually 
> >"grows"  inside the cooling volcanic bomb, no matter what Alex's 
> >volcanologist  friend thinks he might have seen on Vanuatu.  I think 
> >Don will agree--that  just ain't possible.  Those crystals are 
> >"megacrysts", also could be called  "xenocrysts".  They grew 
> somewhere 
> >else when the magma was still deep down,  10s of kilometers 
> deep, and 
> >then they were carried up by the magma and encased  by a glob of it 
> >when it was erupted.  Any crystal growth while embedded in  that 
> >rapidly cooling lava bomb would have been very very minor, on a 
> >microscopic  level along the very surface edges of the megacryst.
> >
> >Pete Modreski
> >
> >
> >
> >************************************** Get a sneak peek of 
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