double refraction text iceland spar crystal calcite specimen with optical birefringence |
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| navigate by keyword : anisotropic background birefringence birefringent calcite calcium carbonate close crystal crystalline double gemstone geological geology iceland light macro material mineral natural object optical optics phenomenon piece polarization raw ray refraction rock sample shooting small spar specimen stone structure surface text textured translucent transparent |
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| Double refraction of text in iceland spar crystal. Calcite specimen with optical birefringence. |
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