mineral

Amazonite

K(AlSi3O8) - Potassium Aluminum Silicate

Hardness: 6-6.5 (Mohs scale); Color: Turquoise-green to blue-green, often with white streaks; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect at roughly 90 degrees; Specific gravity: 2.56-2.58

Hardness: 6-6
Color: Turquoise-green to blue-green, often with white streaks
Luster: Vitreous to pearly

Identified June 22, 2026More mineral →

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Physical properties

Formation & geological history

Amazonite is a green variety of microcline feldspar. It forms primarily in granitic pegmatites and deep-seated igneous rocks through a slow cooling process. The color is thought to be caused by lead impurities and water within the feldspar structure.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons and beads) and as a decorative stone for lapidary work. It is also a very popular specimen for mineral collectors.

Geological facts

Historically called 'Amazon stone,' it was named after the Amazon River, although ironically, no deposits have actually been found there. It is often found associated with Smoky Quartz and Fluorite.

Field identification & locations

Identify in the field by its distinct blue-green color and 'Schiller' effect (a pearly sheen) and grid-like white streaks (exsolution lamellae). Major locations include Colorado, USA; Brazil; Russia; and Madagascar.