Heres one I found in an old house

[sabertooth]

I found this one in the flooring of an old house , any ideas?
Sabertooth

[duffytrash]

too big to tell.....but does the green patch have sparklies in it....look under bright light or in sunlight.....

[Marbleguy]

Is possible I see this result of all the hallucingenics I did during the 1960s. Or because I believ the 'Face on Mars' is real. But sure looks to me like George Washington's profile inside a sulfide marble. Or mebbe it's a pic of a quarter.

[sabertooth]

Hmm yea the picture did go crazy, not sure why they always seem to do this. Anyway I put the quarter there to show size, and no there isnt any sparkles in the green.
Sabertooth

[dank]

Hmm yea the picture did go crazy, not sure why they always seem to do this. Anyway I put the quarter there to show size, and no there isnt any sparkles in the green.Sabertooth

Does it fizz when you lick it?