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Re: Rocks and Minerals Question Marathon

Posted: December 14th, 2011, 3:33 pm
by iYOA
*nvm plz delete this post

Re: Rocks and Minerals Question Marathon

Posted: December 15th, 2011, 5:22 pm
by tornado guy
Here's another one.....
[img]http://upload.wikimedia.org/wikipedia/commons/0/0d/DioriteUSGOV.jpg[/img]

Re: Rocks and Minerals Question Marathon

Posted: December 17th, 2011, 12:31 pm
by hexagonaria
Is it some kind of pegmatite?

Re: Rocks and Minerals Question Marathon

Posted: December 17th, 2011, 12:58 pm
by quizbowl
Diorite

Re: Rocks and Minerals Question Marathon

Posted: December 17th, 2011, 1:36 pm
by hexagonaria
quizbowl wrote:
Diorite
thats what I thought at first but I thought it was too coarse-grained. You could be right though.

Re: Rocks and Minerals Question Marathon

Posted: December 18th, 2011, 4:01 pm
by tornado guy
quizbowl wrote:
Diorite
ya...

Re: Rocks and Minerals Question Marathon

Posted: December 18th, 2011, 4:04 pm
by quizbowl
C:
Image
Tell me something I don't know about this

Re: Rocks and Minerals Question Marathon

Posted: December 22nd, 2011, 9:49 am
by starfield
[hide]Rhyolite[/hide]

Something you don't know...
Eruptions of this advanced form of Igneous rock are rare, only 3 eruptions of Rhyolite have been recorded since the 20th century, the eruptions were at the ST. Andrew Strait Volcano in Papua New Guinea, Novarupta Volcano in Alaska, USA and Chaiten in Southern Chile

Re: Rocks and Minerals Question Marathon

Posted: December 23rd, 2011, 4:22 pm
by hexagonaria
is this supposed to be easy? Because I've been trying to figure this one out for a while and I can't even figure out what it is. :?

Re: Rocks and Minerals Question Marathon

Posted: December 23rd, 2011, 5:08 pm
by quizbowl
starfield wrote:
Rhyolite
Something you don't know...
Eruptions of this advanced form of Igneous rock are rare, only 3 eruptions of Rhyolite have been recorded since the 20th century, the eruptions were at the ST. Andrew Strait Volcano in Papua New Guinea, Novarupta Volcano in Alaska, USA and Chaiten in Southern Chile
Good job! And that's quite awesome.