Calcite Crystal - Iceland Spar at Educational Innovations


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Calcite Crystal - Iceland Spar
PF-2

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$6.95 ea.

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If you look at the words on a printed page through this crystal, you see double. These natural, nearly transparent crystals exhibit the property of 'birefringence', i.e., they can break light into two distinct polarized beams. By rotating a polarizing filter over the crystal, it is possible to view one image at a time! This is a great hands-on demonstration and wonderful when displayed using an overhead projector. Each crystal is about 2 cm x 2 cm x 4 cm. Available while supplies last.

Polarizing Filter Demo Kit

This kit contains materials and suggestions for more than ten different experiments and demonstrations using polarized light.

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Cubic specimens of FeS₂, formed over 100 million years ago by sulfur reacting with iron.

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A high quality red diode laser at an incredibly low price.

Television Stones - Ulexite and Selenite

When the polished bottom surface of a TV stone is placed upon a printed page, the words can be read through it, giving the appearance of a television screen.