Brief Description: The name Microcline derives from the Greek words ?micros? (small) and ?clisis? (angle) because the angle of the two fractures shows a slight deviation from the right angle. It has the chemical formula KAlSi3O8 and it belongs to the Tectosilicates (alkaline feldspars). Its lustre is vitreous, sometimes pearly on fracture surfaces and its colour ranges from colourless to white. It can also be rosy, grey, yellowish or greenish. Amazonite is a variety of microcline and has a bright green colour. It has specific gravity 2.5-2.6 and it is transparent to semi-transparent. Its hardness is 6 and its fusibility 5. It mostly occurs in acidic and intermediate igneous rocks, in several transformed and some sedimentary. It is used in the porcelain, enamel and glass industry. Amazonite is used as ornamental material. 
Bibliography: Ευρετήριο ορυκτών ΑΠΘ στην ιστοσελίδα http://www.geo.auth.gr/106/az_gr.htm Τσιραμπίδης Α. (2005). Ο ορυκτός πλούτος της Ελλάδας. Εκδόσεις Γιαχούδη Θεσσαλονίκη, σελ. 391. Berry, L.G., Mason, B. and Dietrich, R.V. (1983). Mineralogy. W. H. Freeman and Company, San Francisco, 561 pp. Σαπουντζής, Η. και Χριστοφίδης, Γ. (1985). Ορυκτοδιαγνωστική. University Studio Press, Θεσσαλονίκη, 241 σ.