igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite
AI-generated identification · may be incorrectHardness 5-5.5 on the Mohs scale, black base color with white snowflake-like cristobalite inclusions, vitreous luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Hardness 5-5.5 on the Mohs scale, black base color with white snowflake-like cristobalite inclusions, vitreous luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed from rapidly cooling felsic lava where partial crystallization of minerals like cristobalite occurs, typically of Cenozoic age.
Uses & applications
Used primarily in lapidary work for cabochons, beads, decorative carvings, and as a popular specimen for rock collectors.
Geological facts
The snowflake patterns are clusters of radial cristobalite crystals growing within the volcanic glass matrix over time.
Field identification & locations
Easily identified by its opaque jet-black background contrasting sharply with white, snowflake-like patches. Found globally in regions with volcanic activity.
