Aquamarine
Beryl var. Aquamarine · Precious Gemstone
Crystal System
Hexagonal; typically forms as prismatic hexagonal columns, but appears here as a tumbled and polished pebble with a smooth, rounded habit.
Mineral Group
Silicates (Cyclosilicate subgroup)
Chemical Formula
Be3Al2Si6O18
Formation Process
Pegmatitic and hydrothermal formation, crystallizing from cooling magma-rich solutions enriched in beryllium, aluminum, and silicon at high temperatures and pressures.
About This Crystal
A tumbled, pale greenish-blue to light blue specimen with a smooth, polished surface, translucent transparency, vitreous to waxy luster, and subtle internal cloudiness and minor surface fractures typical of tumbled beryl.
Physical Characteristics
Pale blue to bluish-green body color, white streak, no distinct cleavage in tumbled form (basal parting may occur), conchoidal to uneven fracture, specific gravity of approximately 2.68 to 2.74, brittle tenacity.
Optical Properties
Singly or weakly doubly refractive (uniaxial negative), refractive index ranging from 1.570 to 1.583, weak pleochroism showing pale blue and colorless-to-blue angles.
Hardness & Durability
Origin Region
Notable sources include Brazil, Madagascar, Pakistan, Russia, and the United States. Forms primarily in granitic pegmatites and hydrothermal veins.
Hardness & Durability
Mohs hardness of 7.5 to 8, good durability and wearability for jewelry, though internal inclusions or fractures can make it sensitive to severe impacts.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals, ultrasonic cleaners if heavily included, and prolonged exposure to direct sunlight.
Rarity & Value
Common to Uncommon depending on clarity and color saturation. Higher value is placed on deep saturated blue stones (Santa Maria type), while pale tumbled stones are widely accessible and affordable.
Special Characteristics
Subtle internal inclusions and minor natural fissures, characteristic of natural beryl varieties.
Lore & History
Historically used by sailors as a talisman of protection and safe voyage across stormy seas. Associated with the throat chakra in crystal healing traditions, symbolizing tranquility, clarity, and communication.