igneous
Snowflake Obsidian
Spherulitic Obsidian (contains Cristobalite inclusions)
Hardness: 5-6 (Mohs); Color: Black with white or grey spots; Luster: Vitreous (glassy); Crystal structure: Amorphous (glass); Specific Gravity: 2.3 - 2.6.
- Hardness
- 5-6 (Mohs)
- Color
- Black with white or grey spots
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 5-6 (Mohs); Color: Black with white or grey spots; Luster: Vitreous (glassy); Crystal structure: Amorphous (glass); Specific Gravity: 2.3 - 2.6.
Formation & geological history
Formed from rapidly cooling felsic lava where partial crystallization occurs. The \"flakes\" are spherulites of cristobalite (a type of quartz) that grew as the glass cooled. Typically Cenozoic era.
Uses & applications
Used primarily for jewelry (beads, cabochons), ornamental carvings, and by collectors for its unique aesthetic appeal.
Geological facts
Unlike regular obsidian which is purely glass, this variety contains circular needle-like crystals of cristobalite. It is often used in lithotherapy and folklore as a stone of purity.
Field identification & locations
Identified by its distinctive white 'snowflake' patches against a jet black glass background. It is commonly found in areas of past volcanic activity such as Utah, USA or Mexico.
