White Chalcedony
Quartz var. Chalcedony · Semi-Precious Gemstone / Ornamental Stone
Crystal System
Trigonal/Monoclinic; Microcrystalline (Cryptocrystalline) structure featuring a fibrous habit
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2 (Silicon Dioxide) with possible trace amounts of Aluminum or Iron
Formation Process
Formed primarily through hydrothermal processes or chemical precipitation from silica-rich fluids in volcanic rock cavities (vugs) or fossilization of organic matter at low temperatures.
About This Crystal
A smooth, milky white microcrystalline quartz. This specimen is carved into a heart shape, exhibiting a translucent to nearly opaque appearance with a soft, uniform vitreous to waxy luster. It lacks visible crystal faces due to its cryptocrystalline nature and polished finish.
Physical Characteristics
Color is milky white; streak is white. It has no cleavage, a conchoidal fracture, and a specific gravity of approximately 2.6. It is non-magnetic and typically does not fluoresce, though some variants may show a weak green or yellow glow under UV light.
Optical Properties
Refractive index of approximately 1.530 to 1.540. It is usually translucent, showing a hazy light transmission; it is biaxial but difficult to measure due to its microcrystalline fibrous structure.
Hardness & Durability
Origin Region
Notably sourced from Brazil, India, Madagascar, Uruguay, and Namibia; typically found in volcanic cavities and sedimentary environments.
Hardness & Durability
Mohs hardness of 6.5 to 7. It is quite tough and durable due to its dense, interlocking fibrous structure, making it excellent for daily wear in jewelry.
Care & Maintenance
Clean with warm soapy water and a soft brush. While stable, it should avoid exposure to harsh acids (like hydrofluoric acid) and prolonged intense heat. Store separately to avoid scratching softer stones or being scratched by diamonds and sapphires.
Rarity & Value
Common and widely available. Value is determined by translucency, purity of color, and the quality of the carving/polish. It is an affordable gemstone often used in decorative arts and holistic jewelry.
Special Characteristics
Microcrystalline aggregate structure results in a 'waxy' appearance. This specimen lacks inclusions, providing a clean, 'milky' or 'ghostly' aesthetic known in some circles as White Agate when banded, though this specimen appears uniform.
Lore & History
Historically used for amulets and seals in ancient Greece and Rome. In metaphysical traditions, it is often associated with the Crown Chakra and believed to promote harmony, emotional balance, and kindness. It was traditionally seen by sailors as a stone of protection against drowning.