Obsidian

Glass

Image #:

GB10074

Origin:

Natural

Unknown

Treatment:

None/Not detected (AGTA N)

Field of view \ Magnification:

12.87 mm mm

Photography technique(s):

Overhead/oblique illumination

A close look into a "snowflake inclusion" of obsidian shows a cluster of densely packed cristobalite inclusions. The quartz-based inclusions form when silica-rich lava solidifies as glass (obsidian), but the cooling process is relatively slower, allowing patches of recrystallization.

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