A kind of alkali feldspar, microcline might be colourless, white, yellow, pink, red, grey, green or blue-green. However, the semi-opaque, blue-green variety called amazonite (named following the Amazon River) is most often utilized in jewellery, and could be slashed, usually in cabochon, as much as nearly every size. Its striking colour is a result of the existence of lead. The most crucial supply of amazonite is within India. Other localities include the united states, Canada, the first kind USSR, Madagascar, Tanzania and Namibia. Although microcline has got the same composition as orthoclase, its crystal structure is triclinic.
