mineral
Amazonite
Microcline (K(AlSi3O8))
Hardness: 6-6.5 (Mohs), Color: sea-foam green, bluish-green, or turquoise, Luster: vitreous to pearly, Crystal structure: triclinic, Cleavage: perfect in two directions at nearly 90 degrees, Specific gravity: 2.56-2.58
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: sea-foam green, bluish-green, or turquoise, Luster: vitreous to pearly, Crystal structure: triclinic, Cleavage: perfect in two directions at nearly 90 degrees, Specific gravity: 2.56-2.58
Formation & geological history
Forms primarily in granitic pegmatites and metamorphic rocks under slow-cooling conditions deeply underground. Its color is attributed to the presence of lead and water within the feldspar crystal structure.
Uses & applications
Used extensively as a gemstone in jewelry, beads, cabochons, and ornamental carvings. It is also a popular specimen for mineral collectors.
Geological facts
Named after the Amazon River, though no deposits have actually been found there; the name likely confused it with other green minerals from the region. It is the green variety of the potassium feldspar mineral Microcline.
Field identification & locations
Identify by its distinct greenish hue and the presence of white streaky inclusions (perthitic textures). Common locations include Colorado (USA), Brazil, Russia, and Madagascar.
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