Rock Identifier
Amazonite (Amazonite (KAlSi3O8); a green variety of Microcline feldspar) — mineral
mineral

Amazonite

Amazonite (KAlSi3O8); a green variety of Microcline feldspar

Hardness: 6-6.5 Mohs; Color: Pale green to deep turquoise blue; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions meeting at nearly 90 degrees; Specific Gravity: 2.56-2.58

Hardness
6-6
Color
Pale green to deep turquoise blue
Luster
Vitreous to pearly
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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale green to deep turquoise blue; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions meeting at nearly 90 degrees; Specific Gravity: 2.56-2.58

Formation & geological history

Formed in igneous environments, specifically granitic pegmatites and syenites where hydrothermal activity or slow cooling allows for large crystal growth. The green color is attributed to trace amounts of lead and water within the feldspar structure.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a highly sought-after aesthetic specimen for mineral collectors.

Geological facts

Despite its name, Amazonite is not actually found in the Amazon River itself; it was named as such because it was mistaken for other green stones found in that region. It is often found associated with smoky quartz or schorl (black tourmaline) in high-quality specimens.

Field identification & locations

Identify in the field by its distinct blue-green color and the 'perthitic' texture (white streaks or zig-zag patterns caused by exsolution of albite). Common locations include the Pikes Peak area in Colorado, USA, as well as Brazil, Madagascar, and Russia.

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