Amazonite
Microcline var. Amazonite · Semi-Precious Gemstone and Decorative Stone
Crystal System
Triclinic, typically forms prismatic crystals or massive aggregate habits
Mineral Group
Silicates, specifically Tectosilicates (Feldspar group)
Chemical Formula
KAlSi3O8
Formation Process
Pegmatitic and hydrothermal, forming at relatively high temperatures during the final stages of granitic magma crystallization
About This Crystal
Tumbled, polished bead bracelet featuring pale blue-green to turquoise-green stones with characteristic white mottled linear inclusions, characteristic of amazonite's grid-like twinning patterns
Physical Characteristics
Color: Bright turquoise green to pale blue-green with white streaks. Cleavage: Two directions of perfect cleavage at nearly 90 degrees. Fracture: Uneven to conchoidal. Specific gravity: 2.56-2.58. Tenacity: Brittle
Optical Properties
Biaxial negative with a refractive index of approximately 1.514-1.530. Displays a vitreous to pearly luster and is translucent to opaque
Hardness & Durability
Origin Region
Notable sources include Brazil, Colorado (USA), Madagascar, Russia, and India. Forms primarily in granitic pegmatites
Hardness & Durability
Mohs hardness of 6 to 6.5. Moderate durability, sensitive to sudden temperature changes and pressure due to its good cleavage
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, steam, harsh chemicals, and prolonged exposure to direct sunlight to preserve color
Rarity & Value
Common to uncommon, widely available in bead and tumbled stone forms. Value depends on intensity of green/blue color saturation and lack of heavy white streaks
Special Characteristics
Often exhibits a distinct white mottled pattern or grid-like albite twinning known as plaid or tartan twinning, which is characteristic of microcline
Lore & History
Historically associated with ancient Mesopotamian and Egyptian cultures, famously used in the Book of the Dead. In modern metaphysical practices, it is known as the stone of courage and truth, associated with the heart and throat chakras