mineral

Amazonite

Microcline feldspar (KAlSi₃O₈), green variety

AI-generated identification · may be incorrect

Typically turquoise-green to blue-green with white streaks or mottling; vitreous to pearly luster, triclinic crystals, perfect cleavage in two directions, Mohs hardness 6–6.5, and specific gravity about 2.55–2.63. This specimen is polished/tumbled.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granite and pegmatites as feldspar crystallizes from slowly cooling magma, commonly during Precambrian to younger intrusive events. Its color is associated with trace lead, water, and lattice defects.

Uses & applications

Used primarily as a lapidary and decorative stone for cabochons, beads, carvings, and polished specimens; it has little industrial value compared with ordinary feldspar.

Geological facts

Amazonite is not a separate mineral species but a color variety of microcline. Its characteristic blue-green color can fade with prolonged intense light or heat.

Field identification & locations

Identify it by its blue-green color, white veining, moderate hardness, and feldspar cleavage; it is commonly found in pegmatites in Colorado, Brazil, Madagascar, Russia, and Ethiopia. A small polished stone like this is usually worth about $3–$15 USD; exceptional material may sell for $30–$100+.