YesWadhk wrote:Quartz, tectosilicates. If this is correct, quizbowl can post the next question.
I would have also accepted "feldspar", but there are many different types of it, and quartz is more common than any of them.

YesWadhk wrote:Quartz, tectosilicates. If this is correct, quizbowl can post the next question.





[img]http://i40.tinypic.com/20th2rc.jpg[/img]

Fluorite and Calcite?

Halite and Fluorite?




Gold and hematite
<quizbowl> ey kid ya want some shortbread
<EASTstroudsburg13> I don't know why, but I just can't bring myself to delete this post.