mineral

Polished blue-green stone, likely amazonite

Amazonite (microcline feldspar, KAlSi₃O₈)

AI-generated identification · may be incorrect

Hardness 6–6.5 Mohs; pale blue-green color with cloudy white mottling, vitreous to waxy luster, and triclinic crystal structure. The rounded shape indicates tumbling or polishing; cleavage is generally good in two directions.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Amazonite forms in potassium-rich granitic pegmatites as a variety of microcline, crystallizing during late-stage cooling of magma, commonly in Precambrian to younger pegmatites.

Uses & applications

Used for ornamental carvings, cabochons, beads, and collectible specimens; rarely used industrially because attractive material is comparatively uncommon.

Geological facts

Its blue-green color is associated with trace lead and water-related defects in the feldspar lattice, not with copper as sometimes claimed.

Field identification & locations

Common sources include Colorado and Virginia, Brazil, Madagascar, and Russia. Identify it by its blue-green feldspar appearance, blocky cleavage, and hardness below quartz; a photo alone cannot exclude similar aventurine, calcite, or dyed material.