Amazonite

Amazonite (sometimes called "Amazon stone") is a green variety of microcline feldspar.
Because of its bright green color when polished, amazonite is sometimes cut and used as a gemstone, although it is easily fractured.
For many years, the source of amazonite's color was a mystery.
Naturally, many people assumed the color was due to copper because copper compounds often have blue and green colors. More recent studies suggest that the blue-green color results from small quantities of lead and water in the feldspar.
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I miss winter. I'll probably miss summer when winter comes again...