Calcite Crystal - Iceland Spar - Crystals


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Calcite Crystal - Iceland Spar
PF-2

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$5.95 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.

Pyrite Cubes

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

Red Laser Pointer

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

Ulexite - "Television Stone"

When the polished bottom surface is placed upon a printed page, the words can be read on the top surface, giving the appearance of a television screen.