mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
Hardness: 6-6.5 (Mohs); Color: blue-green to green; Luster: vitreous to pearly; Crystal structure: triclinic; Cleavage: perfect in two directions; SG: 2.56-2.58
- Hardness
- 6-6
- Color
- blue-green to green
- Luster
- vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Mohs); Color: blue-green to green; Luster: vitreous to pearly; Crystal structure: triclinic; Cleavage: perfect in two directions; SG: 2.56-2.58
Formation & geological history
Forms in granitic pegmatites and metamorphic rocks through slow cooling of magma, where small amounts of lead replace potassium to create the color.
Uses & applications
Commonly used as a gemstone for cabochons, beads, and carvings, or as a decorative ornamental stone.
Geological facts
Named after the Amazon River, though it was later discovered not to occur there naturally. Its color is thought to be derived from lead and water content in the feldspar lattice.
Field identification & locations
Identified by its distinctive bluish-green color and 'Schiller' effect (fine white streaks of albite). Commonly found in Russia, Brazil, and Colorado (Pikes Peak).
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Epidote
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Mineral
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Mineral/Rock