Obsidian is a naturally occurring volcanic glass formed in swiftly cooling lava that has a high silica content. The color of the stone varies, depending on impurities in the parent lava formation. Golden sheen obsidian is formed when patterns of gas bubbles are aligned along layers created by the flowing lava before it solidified. Snowflake obsidian gets its name and patterns from quartz inclusions in the stone as it forms.
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