Iceland spar

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a transparent calcite found in Iceland and used in polarizing microscopes

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References in periodicals archive ?
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 photoluminescence spectra of Iceland spar (Fig.
These spectra differ from the corresponding spectra of Iceland spar only in more distinctive separation of short-wave [Mn.
2] atmosphere, changed the intensity of this signal by only 2-3%, the observed OSA spectra of Iceland spar and calcites are in essence the excitation spectra of [Mn.