Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions · Semi-Precious Gemstone and Decorative Stone
Crystal System
Amorphous (mineraloid), forms as a volcanic glass with radial clusters of cristobalite
Mineral Group
Mineraloid
Chemical Formula
SiO2 with complex silicates and microcrystalline cristobalite
Formation Process
Igneous, formed from rapidly cooling felsic lava where the lack of time allows crystals to form minimally, resulting in glass interspersed with crystallized white cristobalite inclusions
About This Crystal
A polished, tumbled stone of deep black volcanic glass featuring distinct, stark white or light-grey radial flake-like patterns often resembling snowflakes
Physical Characteristics
Opaque black body with white snowflake patterns, white streak, no cleavage, conchoidal fracture, specific gravity around 2.35-2.45, brittle tenacity
Optical Properties
Vitreous to sub-vitreous luster on polished surfaces, isotropic (singly refractive)
Hardness & Durability
Origin Region
Found globally in regions with volcanic activity including the USA, Mexico, Iceland, Italy, and Japan
Hardness & Durability
Mohs hardness of 5 to 5.5, brittle with sharp edges, moderate durability requiring gentle wear in jewelry
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemicals, ultra-sonic cleaners, and prolonged exposure to hard impacts
Rarity & Value
Common, widely accessible and affordable, with value determined by the contrast and distribution of the snowflake patterns
Special Characteristics
Distinctive snowflake-like inclusions caused by the devitrification of volcanic glass into tiny cristobalite crystals
Lore & History
Historically used for tools and ornaments by ancient cultures, traditionally associated in crystal healing with balance, purity, and grounding the root chakra