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Iceland spar
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Iceland spar
Iceland spar
, formerly known as
Iceland crystal
(; 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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