After some internet research I learned it doesn't set well and isn't the best quality. This explained why one of my tile pieces cracked the next day, when it should have been set. It cracked and sunk--not leaving the best transition. After some excouragement from Dad, I tore it out to try again. You may be wondering why I tore 2 pieces out--well, those pieces coordinated and I have learned from a piece in my "butterfly window" where the grain of the glass does not flow the way I like, that I better not leave it with the wrong piece or it would bother me forever.
I'm still working on learning the title lesson as I do have a tolerance level for imperfections better than many, as manifest by the variable heights of many tiles in the bathrooms. By the way--yes, Mike, I wore a breathing mask to grind the tile out.