Pictures of Knives on Rocks

stabman

Gold Member
Joined
Sep 17, 2007
Messages
21,322
No one knows why we take pictures of knives on rocks, but for some reason many of us do.

Why not post some. :)

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Portland stone
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Breccia, possibly granitic showing clear fragments, itself fragmented and consolidated by Portsland stone.
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This is interesting. The boulder shows an exfoliation pattern so it might be granitic. But it clearly shows some kind of inclusion.
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Tough to say. Could be calcitic (travertine) or silica (chalcedony.) I'm going with chalcedony.
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shale
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