Iceland spar


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Iceland spar

n.
A doubly refracting transparent calcite used in optical instruments.

Iceland spar

n
(Minerals) a pure transparent variety of calcite with double-refracting crystals used in making polarizing microscopes

Ice′land spar′


n.
a transparent variety of calcite that is double-refracting and is used as a polarizer.
[1820–30]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Iceland spar - a transparent calcite found in Iceland and used in polarizing microscopes
calcite - a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
References in periodicals archive ?
In 2011, a research team led by a French physicist named Guy (http://rspa.royalsocietypublishing.org/content/early/2011/10/28/rspa.2011.0369) Ropars built a sunstone using a bit of Iceland spar set into a wooden case that directed light from the sky onto the crystal.
The stone, a calcite substance known as Iceland spar, was found by divers next to a pair of dividers, leading investigators to wonder whether it formed part of the navigational arsenal of the English vessel, which sank in 1592, some four years after the Spanish Armada.
Intense opener Iceland Spar is counterpointed with the moody Slow Wave, and the slow build of closer Smashed To Pieces In The Still Of The Night is a fitting end to an accomplished record.
New research suggests that sunstones could have been a mineral called Iceland spar.
Thermoluminesce nce emission spectra of calcite and Iceland spar. "Nuclear Tracks Radiation Measurements", 10: 581-589.
Evgenii Yakovlevich Kievlenko (1923-2000) was a distinguished exploration geologist and gemologist who, among other achievements in industry, furthered the economic development of several Russian deposits of piezoelectric quartz crystals and "Iceland spar" calcite.