Russ,
My first impression of the turquoise in the image was that it is Chinese. The Chinese mines did in fact have turquoise with a red matrix,this said I looked at many thousands of kilos of rough my first trip to the PRC,I would rarely see the red matrix and it always got high graded to the stash,I'd say that the red matrix was extremely rare and so the turquoise in the image most likely is turquoise that has in fact been doctored.

There are the rare domestic mines that have red matrix common to the mine, a friend has a mine "Red Widow" in Nevada that produces quite a bit of red matrix ......... Again this said red matrix is the rarest and quite uncommon.

I have attached two very poor images of me in the PRC 1987, yes that is a mountain of turquoise I'm standing on..... Yes it was very very cold!!

All my best .......... Danny