Amazonite
According to Gemstone Dictionary, Amazonite, in spite of its name, is found in Russia, Madagascar, Australia and the U.S. It is also found in Brazil, but not in the Amazon.
This stone is opaque to translucent, and comes in various shades between blue and yellowish-green. Also called the Amazon stone, it belongs to the feldspar group of minerals.
Sunstone, Moonstone, and Labradorite are actually forms of Amazonite. This stone is said by New Agers to be a power stone with metaphysical powers involving communication, integrity, and trust.
It is associated with the throat chakra, the seat of communication and integration.