Aquamarine
Beryl var. Aquamarine · Precious Gemstone
Crystal System
Hexagonal system, typically forming prismatic crystals with hexagonal cross-sections, though this specimen is an unworked, water-worn or tumbled pebble.
Mineral Group
Silicates (Cyclosilicate subgroup)
Chemical Formula
Be3Al2Si6O18 (with Fe2+ and Fe3+ trace impurities substituting for aluminum)
Formation Process
Pegmatitic and hydrothermal processes at high temperatures and pressures, crystallizing from cooling magma-derived fluids rich in beryllium.
About This Crystal
The specimen is a small, pale blue-to-teal pebble with translucent to semi-transparent clarity, displaying a vitreous to sub-vitreous luster and a smooth, slightly rounded surface indicative of a water-worn habit or light tumbling.
Physical Characteristics
Color ranges from pale blue to greenish-blue with a white streak. It has poor to indistinct basal cleavage and an uneven to conchoidal fracture. Specific gravity is approximately 2.60 to 2.90. It is brittle with no notable magnetism or strong fluorescence.
Optical Properties
Doubly refractive (uniaxial negative) with a refractive index of approximately 1.570 to 1.590 and weak birefringence. Pleochroism can be noticeable, showing colorless/pale blue to deeper blue-green from different angles.
Hardness & Durability
Origin Region
Notable sources include Brazil, Madagascar, Pakistan, Russia, and the USA (Colorado). Typically found in granite pegmatites and metamorphic rocks.
Hardness & Durability
Mohs hardness of 7.5 to 8, making it durable and suitable for all types of jewelry. It has good toughness, though inclusions can create points of weakness.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonic cleaners if the stone has fluid or fracture inclusions. Store away from harder gemstones to prevent scratching.
Rarity & Value
Common to Uncommon depending on color saturation and clarity. Deep blue stones command high prices, while pale, included specimens like this are affordable and widely accessible.
Special Characteristics
May occasionally exhibit chatoyancy (cat's eye effect) or asterism when cut properly, though this specimen is a simple translucent pebble.
Lore & History
Historically used by sailors as a talisman of safe travel across the oceans and to prevent seasickness. Associated with the throat chakra and believed in crystal lore to promote calm, clarity, and communication.