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- Optical Calcite
- ===== Optical Calcite ====== {{ :gadgets:calcite.jpg?direct&300|}} {{ :gadgets:calcite2.jpg?direct&300|}} Calcite has two different indices of refractive d
- Laser Pens
- ish it was blue. {{:projects:405nmlaser:p1020989.jpg?400|}} Check out my [[:projects:405nmlaser|proje
- Ulexite (Television Stone)
- edia.org/wiki/Ulexite|Wikipedia Article on Ulexite]] {{ :gadgets:ulexite.jpg?direct&300|Ulexite stone}}