mineral

Amazonite

Microcline (Amazonstone), K(AlSi3O8)

Hardness: 6-6.5; Color: turquoise-green to blue-green, often with white streaks; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect at nearly 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 March 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed in granitic pegmatites through the slow cooling of magma. Its distinctive green color is attributed to small amounts of lead and water within the feldspar structure during crystallization.

Uses & applications

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

Geological facts

Despite the name, it is not actually found in the Amazon River; it was named as such due to a confusion with local green stones. It exhibits a unique schiller or shimmer effect known as 'adularescence' in some specimens.

Field identification & locations

Identify in the field by its distinct teal color and blocky, 'stair-step' cleavage planes. Common locations include Pike's Peak (Colorado, USA), Brazil, Madagascar, and Russia. Look for association with white quartz or smoky quartz.