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Rocks and Minerals Question Marathon

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Re: Rocks and Minerals Question Marathon

Posted: December 24th, 2011, 12:28 pm
by starfield
iYOA wrote:
hmm i think it looks more like Apatite
That is correct! Now...how did you know? I can never identify this when it's not in its usual green, hexagonal form...

Re: Rocks and Minerals Question Marathon

Posted: December 24th, 2011, 3:20 pm
by iYOA
ive actually seen quite a few blue samples of apatite and other blue minerals didnt seem to fit as well with that specific shade and luster. 
[img]http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Common%20rocks/Arkose.jpg[/img]

Re: Rocks and Minerals Question Marathon

Posted: December 24th, 2011, 6:31 pm
by hexagonaria
arkose

Re: Rocks and Minerals Question Marathon

Posted: December 26th, 2011, 11:37 pm
by silvertongue
I think its granite

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 6:58 am
by quizbowl
I was looking through my notes and it looks like Hexagonaria is right.

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 11:02 am
by hexagonaria
[img]http://images.yourdictionary.com/images/definitions/lg/aragonite.jpg[/img]

1.  What is this mineral's chemical formual?
2.  Name another mineral with the same chemical formula.

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 11:48 am
by starfield
aragonite, formula: CaCO3, other mineral: Calcite

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 1:41 pm
by hexagonaria
starfield wrote:
aragonite, formula: CaCO3, other mineral: Calcite
nicely done.

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 4:46 pm
by starfield
Identify the minerals and its crystal structure[img]http://skywalker.cochise.edu/wellerr/mineral/epidote/6epidote-brazil-belkis2714.jpg[/img]

Re: Rocks and Minerals Question Marathon

Posted: December 27th, 2011, 9:27 pm
by Wadhk
Epidote? Monoclinic.
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