Amazonite

Physical Properties

Hardness: 6-6.5 (Mohs scale); Color: green to blue-green (due to trace lead content); Luster: vitreous (pearly on cleavage planes); Crystal Structure: Triclinic; Cleavage: perfect in two directions at nearly 90 degrees; Specific Gravity: 2.56-2.58

Formation & Geological History

Found in granitic pegmatites and metamorphic rocks that have undergone hydrothermal alteration. It often forms through slow cooling of potassium-rich magma, allowing for the development of characteristic white streaking (perthite).

Uses & Applications

Primarily used as a gemstone in necklaces, bracelets, and rings. Also used for ornamental carvings, interior decoration, and as a popular specimen for mineral collectors.

Geological Facts

Amazonite is named after the Amazon River, although no deposits are actually found there. It is the green variety of Microcline feldspar. Its color was long believed to be caused by copper, but modern research indicates trace amounts of lead and water are the true cause.

Field Identification & Locations

Identify by its unique blue-green hue and white grid-like streaks (perthitic textures). Common locations include the Pikes Peak area in Colorado (USA), Madagascar, Russia, and Brazil. Collectors look for intense color and sharp crystal faces.

Identified on: 5/2/2026

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