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
Igneous and pegmatitic formation, crystallizing slowly from magma rich in water and rare elements at high temperatures and pressures
About This Crystal
Tumbled chip beads featuring a characteristic bright turquoise-green to blue-green color combined with milky white patches, opaque to translucent transparency, and a vitreous to pearly luster
Physical Characteristics
Color includes turquoise-green, blue-green, white, and brown matrix; white streak; good cleavage in two directions at near-right angles; uneven to conchoidal fracture; specific gravity around 2.56; brittle tenacity
Optical Properties
Biaxial negative with low birefringence; typically exhibits a characteristic grid-like twinning (tartan twinning) under microscopic examination
Hardness & Durability
Origin Region
Notable sources include Russia, Brazil, Madagascar, the United States (Colorado), and India; forms in granitic pegmatites and hydrothermal veins
Hardness & Durability
Mohs hardness of 6 to 6.5; moderate durability with good cleavage making it susceptible to chipping if struck hard; suitable for low-impact jewelry like bracelets and pendants
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, harsh chemicals, and sudden temperature changes; store separately to prevent scratching
Rarity & Value
Common to uncommon; value depends on intensity of green or blue color and minimal white mottling; generally affordable as tumbled chip beads
Special Characteristics
Often displays a characteristic white mottled pattern or schiller effect known as microperthite intergrowths
Lore & History
Associated with soothing energy, truth, and courage; traditionally linked to the throat and heart chakras, though these represent cultural beliefs rather than scientific properties