Yellow Chalcedony
Quartz var. Chalcedony · Semi-Precious Gemstone
Crystal System
Trigonal, microcrystalline habit forming rounded tumbled stones
Mineral Group
Silicates (Tectosilicate subgroup)
Chemical Formula
SiO2
Formation Process
Hydrothermal and low-temperature aqueous deposition, precipitating from silica-rich solutions in rock cavities
About This Crystal
A polished, tumbled smooth oval-shaped gemstone displaying translucent to semi-translucent bright yellow coloration with subtle internal mottling and cloud-like inclusions
Physical Characteristics
Color ranges from pale lemon yellow to golden yellow with a white streak, conchoidal fracture, lack of visible cleavage, specific gravity of approximately 2.60 to 2.65, and brittle tenacity
Optical Properties
Sub-vitreous to waxy luster, doubly refractive with micro-crystalline aggregate structure showing low birefringence and no significant pleochroism
Hardness & Durability
Origin Region
Found globally with notable deposits in Brazil, India, Madagascar, and the USA; forms in hydrothermal veins and cavities
Hardness & Durability
Mohs hardness of 6.5 to 7, exhibiting good durability and toughness, making it highly suitable for everyday jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemical cleaners and prolonged direct exposure to intense heat or direct sunlight
Rarity & Value
Common and widely accessible, with value determined by color saturation, translucency, and size, typically very affordable
Special Characteristics
Microcrystalline fibrous quartz structure, sometimes exhibiting subtle banding or translucency effects under direct illumination
Lore & History
Historically used in ancient seals and carvings, associated in modern metaphysical practices with the solar plexus chakra, vitality, and emotional balance