Snowflake Obsidian
Volcanic Glass var. Snowflake Obsidian · Decorative Stone and Semi-Precious Gemstone
Crystal System
Amorphous (Non-crystalline mineraloid)
Mineral Group
Mineraloid (Silicate-rich volcanic glass)
Chemical Formula
SiO2 with complex silicates and trace iron/magnesium oxides forming cristobalite inclusions
Formation Process
Igneous process where silicic lava cools rapidly without sufficient time for crystal growth, followed by partial devitrification over time which forms radial clusters of cristobalite known as snowflakes.
About This Crystal
A polished, tumbled cabochon of deep black volcanic glass featuring distinct, contrasting white to greyish-white star-like or snowflake-shaped inclusions (cristobalite). It has a smooth, polished surface with a high vitreous to glossy luster and is completely opaque.
Physical Characteristics
Color is jet black with stark white snowflake patches; streak is white; no cleavage; fracture is distinctly conchoidal, yielding very sharp edges; specific gravity is approximately 2.35 to 2.45; tenacity is brittle.
Optical Properties
Isotropic (singly refractive) due to its amorphous structure; opaque with no pleochroism or birefringence.
Hardness & Durability
Origin Region
United States (Utah, Oregon, California), Mexico, Iceland, Italy, and Japan. Forms in felsic volcanic environments.
Hardness & Durability
Mohs hardness of 5 to 5.5; moderate durability; relatively brittle with sharp edges that can chip easily; suitable for pendants and earrings with protective settings rather than high-impact rings.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemical cleaners, ultrasonic cleaners, and steam cleaners; store separately in a fabric-lined pouch to prevent scratching by harder gemstones.
Rarity & Value
Common and widely available; value is very affordable, typically determined by the contrast, size, and pattern distribution of the white snowflake inclusions.
Special Characteristics
Features distinctive radial clusters of white cristobalite crystals (snowflake patterns) embedded within a smooth black volcanic glass matrix, creating a striking visual contrast.
Lore & History
Historically used by ancient civilizations for cutting tools, weapons, and mirrors. In modern metaphysical practices, Snowflake Obsidian is considered a stone of purity, balance, and grounding, traditionally associated with the root chakra to help clear negative energy and calm the mind.