Re: Re: Steve Duggan's photo
Mike - thanks for the post and the comments!
Keep in mind that I'm not a 'rock guy' - I just saw this thing as something pretty unusual. The rock in the photo is nine (9) inches tall and 8 and one half (8.5) inches wide at its widest. It weighs right at ten (10) pounds.
I really don't know how to measure hardness other than to tell you the BLACK will not scratch with a nail while the WHITE will. The BLACK - when seen in cross section (at the bottom where broken) is glassy looking and breaks with a sharp edge. The WHITE scratches rather easily and creates a dust... it's almost like bad concrete.
I don't know how to do an acid test, sorry. The fine straight lines appear to be fractures of some sort - you can actually see into them with a magnifying glass. The rock was found in East Tennessee near the foothills of the Great Smoky Mountains.
A friend showed me some pieces of rock that were coming out of the ground where he was having a basement excavated for a home being built. The area was almost entirely RED CLAY MUD (the 'rusty' looking red on the photo?) - not other rock that I'm aware of. I had him take me to the site and left with three samples - the one pictured, an almost complete triangle shape and another oval (broken in half).
From Steve Duggan - March 29, 2010 at 08:58:56