sorry. Just got back. Hospice placed my dad on crisis care today... That meant we could go see him for first time in three months. He has greatly declined since I last saw him.  I do not believe it will be long..
Back to the tile:   
 I was looking for perhaps some type of trace of silver or or other expensive mineral or ore...   Heck, I don't know. Glass I think.
ALL I did was pay for it. The heck of it was that the wall tile was only about 68 square feet.  The flooring was porcelain I think.  Maybe some OPALS or Rubies mixed in...
All I know is that most ceramic type wall tile at home depot was about $3.00/square foot.  Atthe moment I have to imagine this was well north of that.
Sure hope it is really good well made wall tile. Sure did cost enough.