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Turquoise is a gem
that is widely used since ancient times; it is considered a sacred stone, which
carries good luck. Blue to green, with the most expensive varieties being
"robin's egg blue". Composed of aluminium phosphate with small
amounts of copper and iron is only slightly harder than glass.
It is believed that
turquoise changed colour to signal danger and infidelity. It is considered the
stone of purification, problem solving and relaxation.
Turquoise is also
considered a sacred stone for many American Indian tribes. The Navajos, for
example, used a turquoise-based powder with a pigment to make sand paintings to
attract rain to dry land. Some natives from the United States and Mexico also
place a base of turquoise dust on the graves to protect the dead. The Indian
people put it where they want to build their house as an offering to the gods.
The Aztecs called it the "Stone of the Gods" and used it as an amulet
against evil.
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