Using a large Fresnel Lens to concentrate sunlight allows for some amazing results when focused on a regular river rock. The collection build temperatures can rapidly exceed 3000 ˚F or 1649˚C with the right lens. When cooled the obsidian resembles a shiny black lava like mass. Caution should always be taken when using powerful solar tools. Always work in an open area safely away from kids, pets, structures, and dry brush. Never attempt concentrated solar experiments on a wind day and never leave a Fresnel Lens unattended. Safely store the lens in a light proof container. Eye protection and proper safety gear is also required.
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This is another rock to obsidian example but also includes the combination of glass and steel creating a fused mix that has artistic potential.
A series of articles written by the staff of GPS and other interesting people who have something to share. Topics cover solar energy, science and other relevant topics you can learn something from.
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