Some amazonite cut from Minas Gerais, Brazil. Gem cutting by Afonso Marques. Photo By Eurico Zimbres Zimbres (talk) 17:34, 14 September 2008 (UTC) (Own work) [CC-BY-SA-3.0], via Wikimedia Commons
Amazonite
Amazonite is a variety of microcline, which is itself a variety of feldspar.