mineral

Tumbled green feldspar (likely amazonite)

Microcline feldspar, KAlSi₃O₈ (amazonite variety)

AI-generated identification · may be incorrect

Pale blue-green to green, vitreous to pearly luster, commonly with white streaks or grid-like patterns; Mohs hardness 6–6.5, triclinic crystals, and two good cleavage directions. The image is insufficient for definitive identification; similar material may be green aventurine or another feldspar.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granite and pegmatites as large late-stage crystals, generally associated with Precambrian to younger intrusive rocks. Common sources include Colorado, Brazil, Madagascar, Russia, and Namibia.

Uses & applications

Used as a decorative stone, cabochon, bead, carving material, and mineral-collection specimen; it has little industrial value in this form.

Geological facts

Amazonite’s color is related mainly to trace lead and water-related structural effects in microcline. Its blocky shape and cleavage distinguish it from many green quartz varieties.

Field identification & locations

Look for green-blue color, feldspar cleavage, moderate hardness, and a white streak; a glassy luster and lack of cleavage would favor aventurine quartz. Confirm with hardness, specific gravity, and gemological testing.