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Re: Rocks and Minerals Question Marathon

Posted: October 29th, 2012, 7:20 am
by hexagonaria
Haven't done this in a while, so bear with me here...

I think it is bituminous, which has a lower carbon content than anthracite, and a higher carbon content than lignite. Also, bituminous is more economically important than the other types. As far as identification goes, bituminous is a lot shinier and harder than lignite, and softer and duller than anthracite.

Re: Rocks and Minerals Question Marathon

Posted: October 30th, 2012, 10:31 am
by havendude
Correct. Your turn.

Re: Rocks and Minerals Question Marathon

Posted: November 4th, 2012, 1:44 pm
by XJcwolfyX

Re: Rocks and Minerals Question Marathon

Posted: November 4th, 2012, 5:12 pm
by hotchocolate123
Is it Pegmatite?

Re: Rocks and Minerals Question Marathon

Posted: November 4th, 2012, 7:23 pm
by havendude
Granite?

Re: Rocks and Minerals Question Marathon

Posted: November 11th, 2012, 7:37 am
by XJcwolfyX
Pegmatite! :D
Your turn!

Re: Rocks and Minerals Question Marathon

Posted: November 11th, 2012, 5:00 pm
by hotchocolate123
[img]http://www.geoprime.com/mineral/Images/hornblende.jpg[/img]

Re: Rocks and Minerals Question Marathon

Posted: November 12th, 2012, 3:01 pm
by havendude
hotchocolate123 wrote:
[img]http://www.geoprime.com/mineral/Images/hornblende.jpg[/img]
It looks like either anthracite or hornblende, but probably the latter.

Re: Rocks and Minerals Question Marathon

Posted: November 12th, 2012, 6:23 pm
by hotchocolate123
Hmmm.. It's hornblende :)
Your turn! :D

Re: Rocks and Minerals Question Marathon

Posted: November 14th, 2012, 6:20 pm
by havendude
Image

Identify