|Microcline is a common, but not a well-known mineral and has been used as a semi-precious stone under the names of Amazonite and Perthite. Amazonite is a variety that is deep green and is suitable for carving and polishing. The perthite variety is a stripped, veined or almost zebra patterned stone that is produced from intergrowths inside the crystal.
Well-formed crystals can be quite striking in appearance. At some localities fine amazonite clusters are intermixed with smoky quartz crystals. This results in an outstanding classic mineral specimen.
Amazonite is found in the United States, Brazil, Zimbabwe, Russia, Australia, Namibia. It is usually light green to blue-green, mottled and sometimes contains light striations. A relatively soft stone, Amazonite ranges from 5-6 on the Mohs scale.