mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
Hardness: 6-6.5 (Mohs scale), Color: Green to blue-green (verdigris), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions at nearly 90 degrees, Specific gravity: 2.56-2.58
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Green to blue-green (verdigris), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions at nearly 90 degrees, Specific gravity: 2.56-2.58
Formation & geological history
Formed in plutonic rocks, primarily granitic pegmatites. The green color is attributed to small amounts of lead and water within the feldspar structure. Found in ancient metamorphic belts and igneous intrusions.
Uses & applications
Mostly used for jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral specimen.
Geological facts
Named after the Amazon River, though no deposits are actually found there; it was likely confused with other green stones. The color can fade if exposed to high heat or prolonged direct sunlight.
Field identification & locations
Identified by its signature robin's egg blue or green color and 'schiller' or silken sheen. Common locations include Brazil, Russia, Madagascar, and the Pikes Peak area of Colorado, USA.
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