Obsidian is a formed from volcanic lava that is cooled very quickly before a crystal structure can form, hence making the naturally occurring rock like glass. Pure Obsidian is usually black in appearance.
Snowflake Obsidian is formed where white and grey feldspar crystal inclusions form crystals within the glass like Obsidian to form beautiful snowflake patterns within. Snowflake Obsidian can be found in many parts of the world including Scotland, Italy, Iceland, Hawaii and the USA.