Amazonite
Microcline var. Amazonite · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Triclinic; often occurs as prismatic crystals, massive, or granular aggregates
Mineral Group
Silicates (Tectosilicates); Feldspar Group, Alkali Feldspar Subgroup
Chemical Formula
K(AlSi3O8) with trace amounts of Lead (Pb) and water (H2O)
Formation Process
Igneous; forms via slow cooling in granitic pegmatites and occasionally in hydrothermal veins under relatively low-temperature conditions.
About This Crystal
A translucent to opaque mineral with a characteristic blue-green to turquoise-green color. It often exhibits a vitreous to pearly luster and a distinct 'schiller' or perthitic texture consisting of white streaks or mottled patterns caused by exsolution lamellae of albite.
Physical Characteristics
Color: Mint green to turquoise; Streak: White; Cleavage: Perfect in two directions at roughly 90 degrees; Fracture: Uneven to conchoidal; Specific Gravity: 2.56-2.58; Tenacity: Brittle; Fluorescence: Weak olive-green under UV.
Optical Properties
Refractive Index: 1.522-1.530; Birefringence: 0.008; Pleochroism: Weak; Optical Phenomenon: Often displays a shimmering perthitic sheen known as 'schiller' caused by internal reflections between mineral layers.
Hardness & Durability
Origin Region
Notable sources include Russia (Ilmen Mountains), USA (Pikes Peak, Colorado), Madagascar, Brazil, and Ethiopia. Found in granitic pegmatites.
Hardness & Durability
Mohs Hardness: 6.0 - 6.5; Toughness: Poor due to perfect cleavage; Stability: Sensitive to heat and pressure; Wearability: Suitable for pendants/earrings, but requires care in rings.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and steam cleaners. Store separately to prevent scratching from harder stones; avoid prolonged exposure to intense heat or chemicals.
Rarity & Value
Relatively common; value is determined by the intensity of the blue-green color and the presence of attractive white mottling. High-quality specimens with deep color and minimal brown staining are more valuable.
Special Characteristics
Features a unique 'plaid' or perthitic texture of white and green interlacing. The color is attributed to lead impurities and water within the crystal structure, rather than copper as previously believed.
Lore & History
Known as the 'Stone of Courage' or 'Amazon Stone.' It was used in Ancient Egypt for jewelry and amulets (including beads found in King Tutankhamun's tomb). Historically linked to the Amazon River, though its presence there is debated. In metaphysical lore, it is associated with the Heart and Throat chakras.