Blue Chalcedony
Quartz var. Chalcedony · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline fibrous habit forming rounded tumbled stones
Mineral Group
Silicates, Tectosilicate subgroup
Chemical Formula
SiO2
Formation Process
Hydrothermal and low-temperature aqueous solutions depositing silica in cavities and fractures
About This Crystal
A tumbled, semi-translucent light blue chalcedony stone featuring distinct brownish-yellow iron oxide inclusions and dendrite-like patches scattered throughout the body
Physical Characteristics
Light blue body color with brown inclusions, white streak, conchoidal fracture, no cleavage, specific gravity around 2.60 to 2.66, brittle tenacity
Optical Properties
Refractive index of 1.544 to 1.553, doubly refractive, waxy to vitreous luster, translucent to semi-transparent
Hardness & Durability
Origin Region
Found globally with notable sources in Namibia, Brazil, India, and the USA; forms in hydrothermal veins and cavities
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness due to microcrystalline structure, highly durable for everyday jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemical cleaners, safe from typical sunlight fading
Rarity & Value
Common to uncommon depending on color saturation and clarity, affordable price range, generally untreated
Special Characteristics
Contains visible iron oxide and earthy inclusions creating a scenic or mossy aesthetic within the pale blue chalcedony matrix
Lore & History
Historically used in talismans and seals; in modern crystal healing, it is traditionally associated with the throat chakra to promote calm communication and emotional balance