Thanks, Candy I realized after I posted that the tiles aren't made of asbestos, but asphalt. I don't know where my head was. Anyway, I did some research and found out that the grit is actually "mineral granules", so I thought that doesn't sound so bad. So I checked into what "minerals" were used and found they can be limestone, slate, FLY ASH, or traprock. Well, three out of four aren't harmful, but FLY ASH is used in landfills, it's the residue from burning coal. According to Wikipedia,
"Fly ash, like soil, contains trace concentrations of many heavy metals that are known to be detrimental to health in sufficient quantities. These include nickel, vanadium, arsenic, beryllium, cadmium, barium, chromium, copper, molybdenum, zinc, lead, selenium, uranium, thorium, and radium. Though these elements are found in extremely low concentrations in fly ash, their mere presence has prompted some to sound alarm."
Well, I'm not taking any chances, so it's not going in my pile. I'm just including all this info in case anyone else decides to look into it as well.
Diane