mineral

Amazonite in Matrix

Potassium Feldspar (Microcline), KAlSi3O8

Hardness: 6-6.5 on Mohs scale. Color: Pale green to turquoise blue (the specimen shown is a light seafoam green). Luster: Vitreous (glassy). Crystal Structure: Triclinic. Cleavage: Perfect in two directions. Specific Gravity: 2.56-2.58.

Hardness: 6-6
Luster: Vitreous (glassy)

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed in granitic pegmatites and hydrothermal veins through slow cooling of magma. The green color is attributed to the presence of lead and water within the feldspar lattice. Most specimens date back to the Proterozoic or Paleozoic eras.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular mineral specimen for collectors. Historically used in ancient Egypt for amulets.

Geological facts

Named after the Amazon River, although it is not actually found there. It is the official state mineral of Colorado, where the most famous 'pipe' deposits occur. It often forms with smoky quartz.

Field identification & locations

Identify in the field by its distinct blue-green color and pearly luster on cleavage faces. Commonly found in granitic pegmatite regions like the Pikes Peak area (USA), Brazil, Madagascar, and Russia. Look for blocky crystal habits alongside white or pink orthoclase.

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Mineral/Rock

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