mineral
Amazonite (microcline feldspar)
K(AlSi3O8) - Potassium Aluminum Silicate
Hardness of 6-6.5 on Mohs scale. Pale light blue-green color, vitreous to pearly luster, triclinic crystal system, perfect cleavage in two directions at nearly right angles, specific gravity 2.56-2.58.
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Physical properties
Hardness of 6-6.5 on Mohs scale. Pale light blue-green color, vitreous to pearly luster, triclinic crystal system, perfect cleavage in two directions at nearly right angles, specific gravity 2.56-2.58.
Formation & geological history
Formed in plutonic igneous rocks such as pegmatites and granites through magmatic crystallization. The distinct blue-green color is caused by trace amounts of lead and water trapped in the feldspar matrix.
Uses & applications
Popular as a gemstone, used for beads, cabochons, carved ornaments, and lapidary art. Highly sought after by mineral collectors.
Geological facts
Named after the Amazon River, though no deposits have actually been found there. Native Americans used it to make beads and carved amulets.
Field identification & locations
Identified by its characteristic pale turquoise to mint green color, grid-like grid cleavage planes (perthitic texture), and porcelain-like luster. Found in Colorado and Virginia (USA), Brazil, Madagascar, and Russia.
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