Aquamarine
Beryl var. Aquamarine · Precious Gemstone
Crystal System
Hexagonal system; typically forms long prismatic crystals with flat pinacoids or hexagonal bipyramids. This specimen is a tumbled/polished pebble.
Mineral Group
Silicates; Cyclosilicate (Beryl group)
Chemical Formula
Be3Al2Si6O18 with trace amounts of Fe2+ (ferrous iron)
Formation Process
Primarily Igneous formation within granitic pegmatites through hydrothermal processes during final stages of magma cooling.
About This Crystal
Pale blue to blue-green color, semi-transparent to translucent with a vitreous to waxy luster. This tumbled stone shows internal veining and slight cloudiness common in non-gem grade specimens.
Physical Characteristics
Color: Pale blue; Streak: White; Cleavage: Imperfect basal; Fracture: Conchoidal to uneven; Specific Gravity: 2.66–2.80; Tenacity: Brittle; Fluorescence: Generally inert.
Optical Properties
Uniaxial (-); Refractive Index: 1.572–1.590; Birefringence: 0.005–0.009; Pleochroism: Weak to distinct (colorless to light blue).
Hardness & Durability
Origin Region
Brazil (Minas Gerais), Pakistan, Madagascar, Nigeria, and Vietnam in granitic pegmatites and metamorphic rocks.
Hardness & Durability
Mohs Hardness: 7.5–8.0; Toughness: Is generally good, though inclusions can create weak points; Durable for daily jewelry wear.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners if the stone has liquid inclusions; stable in light but avoid high heat which can alter color.
Rarity & Value
Common globally but high-quality facets are valuable. Value is determined by 'sea water' blue saturation. Heat treatment is common to remove green tints.
Special Characteristics
Can occasionally show chatoyancy (cat's eye) or asterism, though not visible in this tumbled specimen; often contains characteristic 'rain' or tube-like inclusions.
Lore & History
Historically known as the 'Sailor's Stone,' believed to protect those at sea. Associated with the Throat Chakra; symbolizes youth, hope, and health in various cultures.