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I have been working with turquoise for 30 plus years and all I know
is that I know nothing about it. I can identify pieces I have in my
studio and give educated guesses on other pieces but I take cues
from many sources. I bought a bag of rough a few weeks ago which I
thought was Nevada and It turned out to be Chinese, so there you go.
If the piece has certain matrix and color combinations it can be
perhaps pinned down to a state or country. But the difference between
many Nevada turquoises is such that to pin it down to a certain mine
is difficult, same with Arizona and New Mexico. To ID turquoise on
line is damn near impossible. I do love turquoise for those very
reasons, always something to learn about it.
Sam Patania, Tucson