mineral

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Pale blue-green, opaque to translucent, with a vitreous-to-pearly luster and blocky feldspar structure; hardness 6–6.5 Mohs, specific gravity about 2.55–2.63, and two good cleavage directions. The rounded, polished form is consistent with a tumbled specimen.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in coarse-grained granitic pegmatites during late-stage crystallization of silica-rich magma, generally in Precambrian to younger intrusive rocks. Common sources include Colorado and Virginia (USA), Brazil, Madagascar, Russia, and Namibia.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and inexpensive lapidary specimen; rarely used industrially beyond feldspar-related applications.

Geological facts

Its blue-green color is commonly associated with trace lead and water-related defects in the crystal lattice, not copper as sometimes claimed. Color zoning and white albite intergrowths are typical.

Field identification & locations

Identify it by its turquoise-green color, feldspar cleavage, moderate hardness, and frequent white streaking or grid-like internal texture; it is softer than quartz and can be scratched by a steel file. Typical tumbled value is about $2–$10 USD; unusually vivid, large pieces may reach $15–$30.