mineral
Tumbled blue-green stone, likely amazonite
Amazonite, a green microcline feldspar (KAlSi₃O₈)
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
