mineral

Polished blue-green feldspar (likely amazonite)

Amazonite, green microcline feldspar (KAlSi₃O₈)

AI-generated identification · may be incorrect

Blue-green to turquoise coloration with white-gray streaking, vitreous to pearly luster, and a massive polished surface. Mohs hardness 6–6.5; monoclinic crystal structure, two good cleavages, and specific gravity about 2.55–2.63.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms in potassium-rich granite and pegmatites as slowly cooled feldspar, commonly alongside quartz and mica. Most gem-quality material is from Colorado, Brazil, Madagascar, Russia, and Namibia; precise age depends on locality, commonly Precambrian to Mesozoic.

Uses & applications

Used as a lapidary stone for cabochons, beads, carvings, and ornamental objects; occasionally used decoratively in countertops and specimen collections.

Geological facts

The blue-green color is associated with trace lead and water-related defects in the feldspar lattice. Its color can fade with prolonged intense light or heat.

Field identification & locations

Identify it by its blue-green color, blocky feldspar cleavage, moderate hardness, and white cross-hatched or streaky patterns; it should scratch glass but not quartz. The image shows a tumbled or polished specimen, so crystal faces are absent.