Amazonite, also known as Amazonstone, is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. Its chemical formula is KAlSi3O8, which is polymorphic to orthoclase. 

Amazonite is the blue-green variety of microcline (a feldspar). The Morefield Mine, discovered in 1929, produces over 70 different minerals including feldspar (amazonite), mica, beryl, and phenakite. Topaz, garnets and quartz (amethyst) can also be found.
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