mineral

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Hardness: 6–6.5 on Mohs scale; Color: pale green to deep bluish-green, often with white streaks; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.56–2.58

Hardness: 6–6
Color: pale green to deep bluish-green, often with white streaks
Luster: Vitreous to pearly

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms in plutonic igneous rocks, specifically granitic pegmatites. The green color is caused by trace amounts of lead and water within the feldspar structure. It is found in deposits ranging from Proterozoic to more recent geological eras.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), ornamental carvings, and a popular specimen for mineral collectors.

Geological facts

Despite its name, it is not found in the Amazon River; it was named as a marketing term for green stones from that region, though it actually occurs elsewhere in Brazil. It is the only potassium feldspar that exhibits this distinct blue-green color.

Field identification & locations

Identify in the field by its distinct 'schiller' or grid-like white patterns (perthitic texture) and its pale green color. Common locations include the Ilmen Mountains in Russia, Pikes Peak in Colorado (USA), and Minas Gerais in Brazil.

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