igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
AI-generated identification · may be incorrectHardness of 5-5.5 on the Mohs scale, black with white radial clusters of cristobalite, vitreous luster, amorphous crystal structure with conchoidal fracture, and specific gravity around 2.4.
Identified More igneous →
Explore Snowflake Obsidian in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 5-5.5 on the Mohs scale, black with white radial clusters of cristobalite, vitreous luster, amorphous crystal structure with conchoidal fracture, and specific gravity around 2.4.
Formation & geological history
Formed from rapidly cooling felsic lava where minerals begin to crystallize into distinct snowflake-like patterns, typically during the Cenozoic era.
Uses & applications
Widely used in lapidary arts, jewelry making, ornamental carvings, and historical cutting tools due to its sharp edges.
Geological facts
The white snowflake patterns are actually clusters of needle-like cristobalite crystals embedded within the dark volcanic glass matrix.
Field identification & locations
Easily identified by its stark black-and-white contrast and smooth glassy feel; commonly found in regions with active or recent volcanic history like the western United States.
