igneous
Amazonite-bearing pegmatite
Amazonite (green microcline feldspar, KAlSi₃O₈) in a quartz- and mica-rich pegmatite
AI-generated identification · may be incorrectBlue-green feldspar with vitreous to pearly luster and blocky cleavage; microcline hardness is about 6–6.5 Mohs. The dark brown-gray areas are likely mica or other pegmatite minerals; exact identification needs testing.
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Physical properties
Blue-green feldspar with vitreous to pearly luster and blocky cleavage; microcline hardness is about 6–6.5 Mohs. The dark brown-gray areas are likely mica or other pegmatite minerals; exact identification needs testing.
Formation & geological history
Forms as large crystals in slowly cooling, silica-rich granitic pegmatite magma, typically during late stages of crystallization. Pegmatites are found in rocks of many geological ages.
Uses & applications
Amazonite is cut for cabochons, beads, and decorative objects; pegmatite minerals such as feldspar and quartz also have industrial uses.
Geological facts
Amazonite’s color is associated with trace elements and structural defects in microcline; despite its vivid color, it is not a copper mineral.
Field identification & locations
Look for blue-green color, feldspar cleavage, and association with quartz and mica in coarse-grained pegmatites. Common sources include Colorado, Madagascar, Brazil, and Russia.
