Rocks and Minerals Question Marathon

iYOA
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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 26th, 2011, 1:42 pm

revive!!
[img]http://webmineral.com/specimens/photos/Albite1Small.jpg[/img]
a)Identify it
b) Chemical composition?
The picture isn't loading for me.. and I just saw the link when quoting :X

whoops sorry I guess I'll sit out this one

You can still answer if you want as long as you explain why the id makes sense because this marathon is dying :mrgreen:
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Wadhk
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Re: Rocks and Minerals Question Marathon

Postby Wadhk » September 26th, 2011, 10:21 pm

Biotite 
K(Mg, Fe+2)3  (Al, Fe+3) Si3 O10 (OH,F)2
2014 Events: Entomology, Materials Science, Rocks and Minerals, Scrambler

iYOA
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Re: Rocks and Minerals Question Marathon

Postby iYOA » September 27th, 2011, 7:30 pm

well, biotite is typically a very dark color and it doesnt occur fanned out like in the image. so try again
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Re: Rocks and Minerals Question Marathon

Postby sparky007 » October 8th, 2011, 1:21 pm

How do I hide an answer?
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Re: Rocks and Minerals Question Marathon

Postby iYOA » October 8th, 2011, 2:09 pm

you click on the hide button should get:
[hide][/hide]

then follow this format
[ hide] Name of the button | text that is supposed to be hidden [/hide ]

note that i put a space between the first bracket and the h and a space between the very last bracket and the e so that it wouldnt actually hide
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tornado guy
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Re: Rocks and Minerals Question Marathon

Postby tornado guy » October 15th, 2011, 11:54 am

To revive this thread.. Here is an easy one. which rock is this? And what type of rock?
[img]http://upload.wikimedia.org/wikipedia/commons/7/7e/RhyoliteUSGOV.jpg[/img]
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XXGeneration
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Re: Rocks and Minerals Question Marathon

Postby XXGeneration » October 15th, 2011, 12:32 pm

Andesite? It would be an igneous rock if it were andesite.

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Re: Rocks and Minerals Question Marathon

Postby tornado guy » October 15th, 2011, 12:34 pm

Andesite? It would be an igneous rock if it were andesite.
You got the igneous part right! But the rock name is wrong.
EDIT: Here's a hint: The mineral assemblage is usually quartz, alkali feldspar and plagioclase.
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Re: Rocks and Minerals Question Marathon

Postby quizbowl » October 15th, 2011, 1:44 pm

from the description, maybe a rhyolite?
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Re: Rocks and Minerals Question Marathon

Postby tornado guy » October 15th, 2011, 3:19 pm

from the description, maybe a rhyolite?
Yes! Your turn.
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