igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
Hardness: 5-5.5 (Mohs scale); Color: Black with white or gray snowflake-like patches; Luster: Vitreous/Glassy; Structure: Amorphous (glass); Cleavage: Conchoidal fracture; Specific gravity: 2.35-2.60.
- Hardness
- 5-5
- Color
- Black with white or gray snowflake-like patches
- Luster
- Vitreous/Glassy
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Physical properties
Hardness: 5-5.5 (Mohs scale); Color: Black with white or gray snowflake-like patches; Luster: Vitreous/Glassy; Structure: Amorphous (glass); Cleavage: Conchoidal fracture; Specific gravity: 2.35-2.60.
Formation & geological history
Formed through the rapid cooling of felsic lava, which prevents crystal growth. The 'snowflakes' are spherulites of white cristobalite (a type of quartz) that formed as the glass began to devitrify.
Uses & applications
Primarily used for jewelry (beads, cabochons), carvings, metaphysical purposes, and as decorative tumbled stones.
Geological facts
Obsidian was used by indigenous peoples for thousands of years to create sharp blades and arrowheads because of its conchoidal fracture. Snowflake obsidian specifically is a favorite for collectors due to its striking patterns.
Field identification & locations
Identified by its jet-black glassy body and distinct white radial patterns. It is commonly found in volcanic regions, notably in Utah and Oregon, USA, as well as Mexico and Iceland.
