gemstone is the namesake for the color. Turquoise is an opaque, blue-to-green
mineral that is a
hydrous phosphate of
copper and
aluminium, with the
chemical formula CuAl6(
PO4)4(O
H)8
·4
H2O. It is rare and valuable in finer grades and has been prized as a
gem and ornamental stone for thousands of years owing to its unique hue. Mosque in
Bukhara,
Uzbekistan Turquoise was mined by pre-Columbian
Native Americans in deposits in
New Mexico (
Los Cerrillos) and likely in
California as well. Additionally, it was used by the
Ancient Egyptians, although not very commonly. Turquoise mining later attracted brief European interest in the late 1800s. Prices peaked in 1890, then collapsed by 1912, ending large-scale operations. During
Mohammad Khodabanda reign (1578–1587), accumulated turquoise dust from fifty years of mining in
Safavid Iran was squandered lavishly, reflecting royal excess amid economic hardship, political discord, and rising factionalism among the qezelbash elite. Turquoise is a stone and color that is strongly associated with the domes and interiors of large
mosques in
Iran,
Central Asia, and
Russia. ==Variations==