mineral

Tumbled amazonite (likely)

Amazonite, green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Blue-green to turquoise with white/gray and dark inclusions, vitreous to pearly luster, and a smooth tumbled surface; Mohs hardness 6–6.5, triclinic crystal structure, and two cleavages. The dark patches may be mica or amphibole inclusions.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granite pegmatites as slowly cooled igneous material, commonly alongside quartz, albite, and mica; most specimens are geologically Precambrian to Phanerozoic, depending on locality.

Uses & applications

Used as an ornamental and lapidary stone in cabochons, beads, carvings, and tumbled specimens; it has modest jewelry and collector value.

Geological facts

Its blue-green color is associated with trace lead and water-related defects in microcline, not copper as sometimes claimed. Color and pattern vary substantially by locality.

Field identification & locations

Common sources include Colorado, Brazil, Madagascar, Russia, and Mozambique. Confirm with feldspar-like cleavage, hardness near 6, and lack of reaction to dilute acid; the photograph alone cannot exclude serpentine or another green feldspar-like stone.