mineral
Polished blue-green feldspar-rich slab, likely amazonite
Amazonite, green microcline (KAlSi₃O₈), possibly with quartz and albite inclusions
AI-generated identification · may be incorrectTypically Mohs hardness 6–6.5, vitreous to pearly luster, turquoise-green to blue-green color, triclinic crystal structure, and two good cleavage directions. The specimen appears cut and polished, with dark inclusions and mottled coloration.
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Physical properties
Typically Mohs hardness 6–6.5, vitreous to pearly luster, turquoise-green to blue-green color, triclinic crystal structure, and two good cleavage directions. The specimen appears cut and polished, with dark inclusions and mottled coloration.
Formation & geological history
Forms in silica-rich granitic pegmatites during late-stage cooling of magma; commonly associated with quartz, albite, and mica. Most amazonite is geologically Precambrian to Phanerozoic in host pegmatites, though the specimen’s age cannot be determined visually.
Uses & applications
Used primarily as a lapidary stone, ornamental slab, cabochon, and mineral-collection specimen; occasionally used in jewelry. Quality depends on saturated color, translucency, pattern, size, and polish.
Geological facts
Amazonite’s color comes from trace lead and water-related defects in microcline’s crystal structure, not copper. The image may also represent another green feldspar-bearing rock, since exact identification requires mineralogical testing.
Field identification & locations
Look for blue-green color, white streaks or perthitic patterns, feldspar cleavage, and hardness near 6; it should scratch glass but not quartz. Common sources include Colorado and Virginia (USA), Brazil, Russia, Madagascar, and Mozambique.
