Amazonite is a variety of Microcline, also referred to as an alkali feldspar mineral. This crystal forms in small prismatic crystals, or large masses. The colors of Amazonite range from a deep blue, to Turquoise, to blue-green. The stone was first reported back in 1847 by A. Breithaupt and its name derives from the Amazon River in Brazil, which host an abundance of Amazonite. Although it was reported in 1847, Amazonite is believed to have been used for at least 4,000 years. Ancient civilizations such as the Egypt, India, and Mesopotamia used this stone, and even a special scarab ring was found in King Tutankhamen’s burial chamber. Due to it’s forming in masses, many past civilizations used Amazonite as armor, talismans, amulets, trinkets, and writing slabs. For many years Amazonite’s color was believed to be derived from , but a 1985 study suggests otherwise. The study showed that the color was actually created from small traces of lead and water within the feldspar.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.