Geological Setting of Amazonite

The distinctive features are described that influence the geological setting of amazonite as well as the relationship between their deposits and specific genetic types of granitoids. At present, more than 100 large amazonite deposits have been located, along with many lesser known deposits. The deposits of this mineral were formed in various genetic types of granites, including various pegmatites, aplites, and hydrothermal veins, and in subvolcanic rocks. All are characterized by their unique geological setting. The geological age of these amazonite formations varies from Precambrian (1800–2000 Ma) to Mesozoic (60–70 Ma). Pegmatites of Paleocene age (approximately 40 Ma) containing amazonite do occur in the Eastern Alps. The amazonite-bearing pegmatites linked to the formation of alkaline granites are the oldest (Precambrian) and occur in the deepest crustal levels, whereas the Mesozoic F–Li granites are younger and found at shallower levels.