Iceland Spar Optical Calcite Rhombohedron prisms, average size - 3-4cm x 3cm x 1.5cm. Sold Singly
Natural Calcite Rhombohedron prism, Iceland Spar. Translucent some Rainbows. The edges are not polished, and have lovely crystal structures all over the sides.
A Viking Compass stone, Iceland Spar's naturally occurring prisms and clear interior provides a natural means of harnessing the suns rays, even on a cloudy day, thus is can help provide a directional aid to East and West for a Navigator, by helping one locate the position of the sun. There are two stones, attributed this fabled use of the stone, Iceland Spar and Selenite, both have similar optical properties.
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