mineral

Tumbled blue-green stone, likely amazonite

Amazonite, a green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Typically blue-green with white clouding, vitreous to pearly luster, Mohs hardness 6–6.5, triclinic crystal structure, and two cleavages at nearly right angles. The rounded shape indicates tumbling or polishing.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granitic pegmatites during late-stage igneous crystallization, commonly in Precambrian to Phanerozoic granitic terrains. Exact identification is uncertain from the photograph; similar appearance can occur in dyed or treated materials.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and ornamental specimens; occasionally used in jewelry. Common polished pieces generally have modest commercial value.

Geological facts

Amazonite’s color is associated with trace lead and water-related defects in microcline. The blue-green color and pale perthitic or cloudy pattern are characteristic, but testing is needed for confirmation.

Field identification & locations

Common localities include Colorado and Virginia, USA; Brazil, Madagascar, Russia, and Mozambique. Confirm with hardness, cleavage, specific gravity (~2.55–2.58), and refractive index; avoid acids and heat.