Amazonite
Microcline var. Amazonite · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Triclinic; typically occurs in blocky, prismatic crystals or massive habits, often showing perthitic texture.
Mineral Group
Silicates (Subgroup: Tectosilicates; Feldspar group)
Chemical Formula
K(AlSi3O8) with trace Lead (Pb) and water (H2O) affecting color
Formation Process
Igneous formation via slow cooling in plutonic rocks and granitic pegmatites, often at low to moderate temperatures for feldspar crystallization.
About This Crystal
A light green to bluish-green gemstone with a vitreous to pearly luster. It is translucent to opaque and frequently displays white streaks or a marbled 'spider-web' pattern due to perthitic intergrowth with albite.
Physical Characteristics
Color: Teal/Green; Streak: White; Cleavage: Perfect in two directions at nearly 90 degrees; Fracture: Uneven to splintery; Specific Gravity: 2.56-2.58; Fluorescence: Weak olive-green or tan under UV.
Optical Properties
Refractive Index: 1.522–1.530; Birefringence: 0.008; Optically biaxial negative. It may exhibit a slight schiller or pearly sheen on cleavage planes.
Hardness & Durability
Origin Region
Madagascar, Russia (Ilmen Mountains), Brazil (Minas Gerais), and USA (Pikes Peak, Colorado); typically found in granitic pegmatites.
Hardness & Durability
Mohs hardness: 6.0 to 6.5; Brittle toughness; sensitive to pressure and impact due to perfect cleavage.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and steam cleaners. Sensitive to sudden temperature changes and can fade if exposed to prolonged intense sunlight.
Rarity & Value
Relatively common but high-quality deep blue-green pieces are uncommon. Value is based on color intensity and lack of white inclusions; often untreated but can be dyed or resin-impregnated.
Special Characteristics
Displays 'schiller' or adularescence in some specimens; characteristic white grid-like or streaked perthitic textures are common identifiers.
Lore & History
Namely called 'Amazon Stone' after the Amazon River, though deposits there are scarce. Historically used in Ancient Egypt for jewelry and amulets (King Tut's burial mask contained amazonite). Traditionally associated with the Heart and Throat chakras, symbolizing truth, honor, and calming energy.