mineral
Amazonite
Microcline feldspar (KAlSi3O8)
Hardness: 6 on the Mohs scale. Color: Pale green to bright turquoise-green with whitish striations or mottled patterns. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly right angles. Specific gravity: 2.56-2.58.
- Hardness
- 6 on the Mohs scale
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6 on the Mohs scale. Color: Pale green to bright turquoise-green with whitish striations or mottled patterns. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly right angles. Specific gravity: 2.56-2.58.
Formation & geological history
Forms in granitic pegmatites and hydrothermal veins, typically crystallizing during the late stages of magma cooling. Often associated with quartz, albite, and mica.
Uses & applications
Widely used in ornamental carvings, beads, cabochons, and jewelry pieces like pendants.
Geological facts
The vibrant green color of amazonite was historically attributed to copper, but modern studies show it is caused by small amounts of lead and water trapped in the feldspar structure.
Field identification & locations
Identified by its distinctive grid-like, mottled green and white patterning and microcline cleavage. Found notably in Russia, the United States (Colorado), Brazil, and Madagascar.
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