The cooled lava (pumice) is full of gas bubbles that give the stones very sharp edges.

2012/10/28 12:57:49

Exposure mode: program (auto)
Metering Mode: matrix
Exposure time: 0.0025 s (1/400)
Aperture: f/4.5
Focal length: 8.0mm (35mm equivalent: 37mm)
ISO: 80
Flash: No
File size: 2673161 bytes
Camera maker: FUJIFILM
Camera model: FinePix F10
Resolution: 2848 x 1898

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