mineral
Amazonite (Microcline Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
Hardness: 6-6.5 on Mohs scale. Color: Pale blue-green to teal. Luster: Vitreous to pearly. Crystal System: Triclinic. Cleavage: Perfect in two directions.
- Hardness
- 6-6
- Color
- Pale blue-green to teal
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale. Color: Pale blue-green to teal. Luster: Vitreous to pearly. Crystal System: Triclinic. Cleavage: Perfect in two directions.
Formation & geological history
Forms in igneous rocks, predominantly granite pegmatites and syenites, through hydrothermal activity involving potassium-rich fluids.
Uses & applications
Used primarily as a gemstone, for lapidary work, beads, ornamental carvings, and in mineral specimen collections.
Geological facts
Its distinctive green-blue color was long believed to come from copper, but modern research indicates it is caused by trace amounts of lead and water trapped within the feldspar lattice.
Field identification & locations
Identified by its distinctive light blue-green hue, blocky cleavage, and hardness. Common localities include Colorado and Virginia (USA), Madagascar, Brazil, and Russia.
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Mineral
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Mineral/Rock