mineral
Amazonite
Microcline Feldspar (KAlSi3O8)
Hardness of 6-6.5 on the Mohs scale, distinct bright turquoise to blue-green color often with white striations, vitreous to pearly luster, monoclinic/triclinic crystal system, good cleavage in two directions, specific gravity around 2.56-2.58.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, distinct bright turquoise to blue-green color often with white striations, vitreous to pearly luster, monoclinic/triclinic crystal system, good cleavage in two directions, specific gravity around 2.56-2.58.
Formation & geological history
Formed in granitic pegmatites and hydrothermal veins, crystallization occurs from cooling magma rich in potassium, aluminum, and water, often influenced by trace amounts of lead and water.
Uses & applications
Widely used in gemstone jewelry, ornamental carvings, beads, and as a collector specimen.
Geological facts
Despite its name, no deposits of amazonite have ever been found in the Amazon River basin; the green stones found there were likely nephrite jade or similar minerals mistakenly identified by early explorers.
Field identification & locations
Easily identified by its characteristic bright green-blue color and grid-like white streaks (albite twinning). Found in the USA, Russia, Brazil, Madagascar, and Austria. Collectors look for vibrant saturation.
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral