Scioly.org

Posted: **January 1st, 2012, 8:01 pm**

Nope! This is quite tricky..

Posted: **January 2nd, 2012, 12:31 pm**

it looks like ice cream to me (Click to Show Hidden Text)

aragonite? or calcite?

Posted: **January 2nd, 2012, 1:01 pm**

That picture is waaaay too hard, so here's another specimen in its natural habitat.

Posted: **January 2nd, 2012, 2:04 pm**

Ah (Click to Show Hidden Text)

Topaz?

Posted: **January 2nd, 2012, 2:06 pm**

Yep! It was quite an odd pseudomorph..

Posted: **January 2nd, 2012, 2:22 pm**

ID the rock.
What is the main mineral in this rock? What is the chemical formula for this mineral?

Posted: **January 2nd, 2012, 2:27 pm**

OMG I LOVE YOU FOSSILS (Click to Show Hidden Text)

Coquina is calcium carbonate, right? CaCO3

Posted: **January 2nd, 2012, 2:34 pm**

quizbowl wrote:
OMG I LOVE YOU FOSSILS (Click to Show Hidden Text)
Coquina is calcium carbonate, right? CaCO3

yep, your turn

Posted: **January 2nd, 2012, 2:47 pm**

Posted: **January 2nd, 2012, 2:57 pm**

answer (Click to Show Hidden Text)

corundum

Rocks and Minerals Question Marathon