Here are photos of a couple of hones that came my way about which I know nothing. The first stone is a grey-green on one side and a maroon on the other. It has an uneven separation between the two.Attachment 48445
The other is a Glass Hone which appears to be a sandblasted glass surface.
Attachment 48446
Does anyone have an idea about what the top stone is and how to use the glass stone?
Thank you!
~Geezer