![](http://www.alamy.com/thumbs/6/9CB08104-FA29-4F7A-90EF-AB280849D57A/2P779F8.jpg)
Iceland spar, formerly called Iceland crystal, is a transparent variety of calcite, or crystallized calcium carbonate
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Photo credit: © Henri Koskinen / Alamy / Afripics
License: Royalty Free
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Keywords: aurinkokivi, birefringence, calcite, calcium, carbonate, crystal, crystallized, geology, iceland, islanninsälpä, kalsiitti, mineral, mineralogy, navigation, optical, spar, transparent