mineral

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Pale blue-green, opaque to translucent, with vitreous-to-waxy luster; Mohs hardness 6–6.5, triclinic crystal structure, and two good cleavage directions. The rounded surface indicates tumbling and polishing.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granitic pegmatites during late-stage cooling of felsic magma, commonly in Precambrian to Phanerozoic granitic systems. Typical localities include Colorado, Madagascar, Brazil, Russia, and Namibia.

Uses & applications

Used as an ornamental stone, cabochon, beads, carvings, and mineral-collection specimen; it has little industrial value compared with ordinary feldspar.

Geological facts

Amazonite’s blue-green color is linked mainly to lead and water-related structural defects, not copper as sometimes claimed. It is a variety of microcline, rather than a separate mineral species.

Field identification & locations

Identify it by its blue-green color, feldspar-like cleavage, moderate hardness, and occasional white grid-like perthitic streaks; confirm with gemological testing because dyed quartz and other green stones can resemble it.