mineral

Amazonite

Microcline (K(AlSi3O8))

Hardness: 6-6.5 on Mohs scale; Color: bright green to turquoise/blue-green with white streaking; 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
Color: bright green to turquoise/blue-green with white streaking
Luster: vitreous to pearly

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in plutonic rocks, specifically granitic pegmatites. The green color arises from trace amounts of lead and water within the feldspar lattice. Most specimens date back to the Proterozoic or Paleozoic eras.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for mineral collectors due to its vibrant color.

Geological facts

Amazonite was named after the Amazon River, though no deposits exist there. It was likely confused with other green stones found in that region historically. It is the official gemstone of Colorado.

Field identification & locations

Identify by its distinct blue-green color and the presence of white 'perthitic' (exsolution) lamellae or streaks. Common locations include the Pikes Peak area in Colorado, USA, as well as Brazil, Madagascar, and Russia.