Morenci turquoise mine produced a turquoise that is light to bright
blue in hue. This stone has an unusual matrix of irregular quartz and
pyrite that, when polished, often resembles silver. Also, a small
amount of Morenci turquoise had some brownish matrix called “Morenci
red matrix”. One of the first American turquoises to come to the
market, Morenci is highly valued and difficult to obtain.
Morenci mine is in southeastern Arizona and is now closed and buried
under tons of rock. The land was leeched with chemicals that would
destroy any trace of turquoise, which means that there is never a
chance to re-open this mine. The former miners of Morenci still have
quite a stash of rough stone, enough to release a small amount every
year to keep it available.