When I started showing my tables in 2012 I was showing table tops using only Lyons sandstone. My colleague suggested I start using focus stones in the design. I found these two slabs of german limestone dendrite at the Denver Gem and Mineral show and ft them into the design.
I've since used up all the dendritic limestone. The seller from Bad Homborg germany doesn't bring these simple slabs to the Gem and Minearl Show any more, they have moved on to more exoitic pieces with fish and other fossils included.... BUT if you have a slab of dendritic limestone, or any other stone for that matter, send me a picture and give me the dimensions and lets see what kind of table top I can make using it.