Mineral
Amazonite
Potassium Feldspar (KAlSi3O8)
Hardness: 6-6.5 (Mohs), Color: Turquoise-green to blue-green with white streaking, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect, Specific gravity: 2.56-2.58
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Turquoise-green to blue-green with white streaking, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect, Specific gravity: 2.56-2.58
Formation & geological history
Formed in plutonic rocks, primarily granitic pegmatites. The green color is derived from trace amounts of lead and water within the feldspar lattice during hydrothermal processes.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular mineral specimen for collectors.
Geological facts
Historically named after the Amazon River, though no deposits are actually found there. It is the only gemstone variety of the mineral Microcline.
Field identification & locations
Identify by its distinct 'shiller' or mesh-like white streaks against a green-blue background. Commonly found in Brazil, Russia (Urals), Ethiopia, and the USA (Colorado).
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Arenite (SiO2 based)
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Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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