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What is this rock from Buffalo Gap Grasslands SD? Agate? I call it salmon steak

+1 vote

I found this last spring at Buffalo Gap Grasslands.  I like how it looks like a salmon steak, but I haven't found any pictures online like it.  But I've been searching for 'agate,' and maybe it's not an agate after all.  Any ideas?

Also, how would I polish it?  I think I will keep it as a paperweight.  

asked Jun 18, 2019 by newrockster (130 points)

1 Answer

0 votes
It is not an agate. It could be a rock covered in chalcedony after glacial action. All the rocks in a pudding stone get covered in the alluvial sediments and some hardens into the differing stones of a pudding stone. The stone formed is chalcedony. If the outside feels waxy and is very hard, (can't scatch it with a nail hard) that is most likely it.

The rock itself might be a jasper of some kind.
answered Jun 21, 2019 by Weasel (58,940 points)