White Chalcedony
Quartz var. Chalcedony · Semi-Precious Gemstone and Decorative Stone
Crystal System
Trigonal, microcrystalline or cryptocrystalline quartz forming massive, nodular, or botryoidal habits
Mineral Group
Silicates - Tectosilicates
Chemical Formula
SiO2
Formation Process
Low-temperature hydrothermal deposition or precipitation from silica-rich aqueous solutions in cavities of volcanic and sedimentary rocks
About This Crystal
A smooth, polished oval cabochon displaying a milky, translucent to opaque white body color with a soft waxy to vitreous luster and a uniform, flawless appearance
Physical Characteristics
Color is milky white with a white streak; massive cryptocrystalline form lacking visible cleavage planes; conchoidal to uneven fracture; specific gravity around 2.60 to 2.65; brittle tenacity; generally inert to weak fluorescence under UV light
Optical Properties
Singly or doubly refractive microcrystalline aggregate with a refractive index of approximately 1.535 to 1.539; displays a sub-vitreous to waxy luster and subtle internal translucency without pleochroism
Hardness & Durability
Origin Region
Found globally with notable deposits in Brazil, India, Madagascar, and the United States; forms in volcanic cavities and hydrothermal veins
Hardness & Durability
Mohs hardness of 6.5 to 7; good toughness due to its microcrystalline interlocking fibrous structure; high stability and excellent wearability for daily jewelry use
Care & Maintenance
Safe to clean with warm soapy water and a soft brush; avoid harsh acids or prolonged exposure to extreme heat; store separately from softer gemstones to prevent scratching
Rarity & Value
Common and widely available; value is determined primarily by size, polish quality, and translucency, generally very affordable unless featuring rare colors or patterns
Special Characteristics
Cryptocrystalline structure composed of microscopic quartz fibers; exhibits a smooth, polished tactile quality and a soft internal glow or adularescent-like translucency
Lore & History
Historically used in ancient carvings, seals, and amulets across various civilizations; in modern crystal healing, white chalcedony is traditionally associated with the crown chakra, promoting emotional balance, inner peace, and calm energy (noted as traditional belief rather than scientific fact)