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Interesting findings and cool pics! At the end of the day, identifying the stones is better left to geologists. As long as you are getting great results from these stones and great shaves from them,...

Whatever they are, they look to be producing fairly large microchips in the edge. Not sure how normal that is but it doesn't look to be anything close to a finishing quality stone.

Also, did you...

Why could it be a silkstone?

Well... because that's how it looks to me. http://straightrazorpalace.com/hones/50132-anyone-have-silkstone-whats-story-3.html

Maybe a 'silkvein' stone or similar?...

Can't wait for the pics :) I'm almost positive that's a silkstone though.

The one with the parallel lines could be a silkstone?