What is the color name? There are lots of slates and quartzite/sandstones from India and China on the market. All are pretty soft and might discolor from harsher shower cleaning products or even water if not sealed well. They are also fairly heavy in cleft which could effect ability of the pan to drain.

Vermont Slates (black, red, purple and mottled) are much denser in addition to having a finer cleft. Would drain better and you'd probably never stub your toe on them.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)