mineral

Amazonite

Potassium aluminum silicate (KAlSi3O8)

Hardness: 6-6.5 (Mohs scale); Color: green to blue-green (often with white streaks); Luster: vitreous (glassy) to pearly; Crystal structure: triclinic; Cleavage: perfect in two directions; Specific gravity: 2.56-2.58.

Hardness: 6-6
Color: green to blue-green (often with white streaks)
Luster: vitreous (glassy) to pearly

Identified May 3, 2026More mineral →

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Physical properties

Formation & geological history

Forms in granites, pegmatites, and some metamorphic rocks. The color is caused by trace amounts of lead and water within the feldspar structure during its formation deep in the earth's crust.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons, beads, and carvings) and as a collector's mineral specimen. Also used in decor.

Geological facts

Also known as Amazon Stone, it is a variety of microcline feldspar. Despite its name, it is not actually found in the Amazon River itself, but in neighboring regions. It was once thought to be named after the Amazon women warriors who allegedly used it for protection.

Field identification & locations

Look for the distinctive teal/turquoise-green color combined with white streaks (exsolution lamellae), similar to marble. Common locations include Colorado (USA), Madagascar, Russia, and Brazil.