mineral

Tumbled blue-green stone, likely amazonite

Amazonite (green microcline feldspar), KAlSi₃O₈

AI-generated identification · may be incorrect

Pale blue-green, smooth and rounded from tumbling, with a waxy-to-glassy luster; microcline has triclinic crystal structure and Mohs hardness 6–6.5. The image is insufficient to confirm cleavage, density, or mineral identity.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Amazonite forms in potassium-rich granitic pegmatites as feldspar crystallizes from late-stage magma, generally in Precambrian to younger intrusive rocks. Common sources include Colorado and Virginia (USA), Brazil, Madagascar, and Russia.

Uses & applications

Used primarily for cabochons, beads, carvings, and decorative objects; it has limited industrial value compared with ordinary feldspar. Small tumbled pieces are inexpensive collectible material.

Geological facts

Its blue-green color is commonly associated with trace lead and water-related structural defects, not copper as sometimes claimed. Similar-looking materials include dyed quartz, chrysoprase, aventurine, and glass.

Field identification & locations

Field identification requires hardness testing, feldspar cleavage, and ideally a refractive-index or chemical test; amazonite commonly shows white grid-like perthitic streaks. A typical tumbled stone is worth about $1–$10 USD; exceptional large, vivid specimens may sell for $20–$100+.