Iceland spar

Iceland spar, formerly known as Iceland crystal (Icelandic:silfurberg; lit. silver-rock), is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light (see polarimetry). It occurs in large readily cleavable crystals, easily divisible into rhombs, and is remarkable for its double refraction.

单词	Optical calcite
释义	Optical calcite 英语百科 Iceland spar Iceland spar, formerly known as Iceland crystal (Icelandic:silfurberg; lit. silver-rock), is a transparent variety of calcite, or crystallized calcium carbonate, originally brought from Iceland, and used in demonstrating the polarization of light (see polarimetry). It occurs in large readily cleavable crystals, easily divisible into rhombs, and is remarkable for its double refraction.
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Optical calcite

Iceland spar