mineral

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Pale blue-green, polished, with cloudy white streaks and possible cleavage lines; vitreous to waxy luster. Mohs hardness 6–6.5, triclinic crystal structure, two good cleavage directions, specific gravity about 2.55–2.63.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granite pegmatites as a late-crystallizing feldspar, commonly alongside quartz and mica. Most specimens formed during Precambrian to Phanerozoic pegmatite activity, depending on locality.

Uses & applications

Used primarily as a lapidary stone for cabochons, beads, carvings, and tumbled specimens; rarely used industrially because of its attractive color and limited abundance.

Geological facts

Its blue-green color is associated with lead and water-related defects in the feldspar structure, not necessarily copper. The name comes from the Amazon River region, although notable deposits occur elsewhere.

Field identification & locations

Identify it by its turquoise-green color, feldspar cleavage, moderate hardness, and white perthitic or cloudy pattern; it is softer than quartz and can be scratched by a steel file. Common sources include Colorado and Virginia (USA), Brazil, Madagascar, and Russia.