Aquamarine
Beryl var. Aquamarine · Precious Gemstone
Crystal System
Hexagonal; typically forms elongated hexagonal prisms, but this specimen is a tumbled/polished pebble habit.
Mineral Group
Silicates (Cyclosilicate subgroup)
Chemical Formula
Be3Al2Si6O18 + Fe
Formation Process
Primarily Igneous-Pegmatitic; forms from the late-stage crystallization of magma in hydrothermal-rich cavities.
About This Crystal
A tumbled, translucent pebble of pale greenish-blue color. Exhibits a waxy to vitreous luster and contains visible internal veil-like inclusions and brownish iron-oxide staining.
Physical Characteristics
Color: Sea-foam blue; Streak: White; Cleavage: One direction (imperfect); Fracture: Conchoidal; Density: 2.66-2.80; Non-magnetic.
Optical Properties
Refractive Index: 1.57-1.58; Weakly Dichroic (blue to colorless); Doubly Refractive; Non-fluorescent under UV light.
Hardness & Durability
Origin Region
Commonly sourced from Minas Gerais, Brazil; Madagascar; and Pakistan. Often found in granitic pegmatites.
Hardness & Durability
Mohs Hardness: 7.5 to 8.0. High durability for jewelry, though internal fractures can make it susceptible to heavy impacts.
Care & Maintenance
Clean with warm soapy water. Avoid steam cleaning or ultrasonic cleaners if the stone has significant inclusions. Store away from direct intense heat.
Rarity & Value
Relatively common in lower grades; value increases significantly with deeper blue saturation and higher transparency. This specimen is a mid-range decorative grade.
Special Characteristics
Displays translucency and classic 'sea-water' coloration; contains internal 'gas-liquid' inclusions often referred to as 'rain' or 'veils'.
Lore & History
Historically known as the 'Sailor's Guard' for protection at sea. In lore, it is associated with the throat chakra and believed to promote calm, clear communication.