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Iceland Spar | optical calcite rhombus100% SSL Secure
Each clear piece of spar is unique and formed natural as a rhombus with tiny inclusions that flash in rainbow colors. This unique crystal has been used in ancient times to study the sun and to understand how light works as a wave. In the medieval times it was called a 'sun stone' since it was used to locate the sun in the sky when obstructed from view for navigation.