I really hope someone can help me. I read a thread about using marble tiles for frag disc's and thought it was a great idea. So i bought these 3x6 Noce Tumbled Travertine tiles from Home Depot thinking I could cut them in half for 3x3 tiles. They also have 1x1 2x2 and 4x4 tiles. I search and only found out that (Travertine is a type of "morphed" limestone, where the lime content has been deposited by water. Travertine is about 50 million years old. Travertine Pavers are ideal for use around the pool and patio areas, for they will stay cool on your feet and are freeze-thaw compatible. Travertine pavers have a non-slip surface finish, for they have a high co-efficient of friction. Travertine pavers can withstand weathering and erosion without deteriorating. It is known that Travertine material improves with age. Colors will not fade over time. Travertine pavers will maintain their natural color for decades. Another great benefit is that Travertine pavers require little to no maintenance or cleaning. They are simply a natural hardwearing stone. Travertine is a versatile, durable and reliable material.) So I'm thinking these may work great but I'm worried about the word limestone? These would work really great only if they are safe!! thanks much