Iceland Spar is a clear, transparent, colorless crystallized variety of calcite. It is best known for exhibiting the optical properties or double refraction...anything viewed through the crystal appears double. It was first found in Iceland, hence the name, but has been found in a few other areas such as New Mexico. It's used for many things including LCD screens and optical equipment. It has been linked to stories of it's use in viking navigation and has been dubbed the "Viking Sunstone." It is also believed that it has healing powers for migraine headaches. I might need to get one and test this theory.
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