Rocks Photography is Coming

Chalk

I purchased some rocks from the Laures last summer.  I finally got around to going through them recently.  I found three that I immediately pulled out.  This was one.  I read that chalk should have fossils in it but I could not see any in this shot.  This is a near microscopic magnification.

Crystal Tuff

I first thought this might be sulfur because of the yellow color.  It seems to have a yellow dust on it.  It did not have the characteristic odor.  It is not dense.  I tried to see if it would float in water like pumice.  It did not.  Crystal Tuff is the closest I could come in my field guides.  If anyone knows better than I do, please comment.

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