They are similar to the Apache Strata but the edges are markedly more aggressive but still smooth. I took several different razors (Sheffield, Solingens, Japanese, etc.) Chosera 1K, Norton 4/8K and finished on the Black Gila, the results were outstanding and they were consistent on all four hones. I did two razors the same way but went AS followed by the ABG and the edges were more refined. I test shaved with all the razors this morning and the results were awesome. I'm compiling the information and forwarding it to Terry.
At one point, Terry told me there was a coarser stone he could mine and sell (i.e., coarser than Apache red). I don't suppose this is it. They look interesting in any case.
The main differences for me between the Black Gila and the Strata are in aggressiveness and feedback. The edges off the Gila are markedly more aggressive and has less pressure sensitive feedback than the Apache. The added aggressiveness does not comprise its smoothness which is very cool.