| 1. | Single calcite crystals display an optical property called birefringence ( double refraction ).
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| 2. | Anyway, DR is short for double refraction, a synonym of birefringence.
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| 3. | An object viewed through Iceland spar appears as two because of double refraction.
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| 4. | It is extremely hard and has a double refraction.
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| 5. | Some solid materials under specific conditions can demonstrate double refractions and optic axes.
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| 6. | It produces a unique surface glow due to the double refraction of calcite crystals.
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| 7. | In 1678, Huygens discovered the polarization of light by double refraction in calcite.
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| 8. | Non-crystalline materials have no double refraction and thus, no optic axis.
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| 9. | They may exhibit pleochroism or double refraction.
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| 10. | In other words, because Gananite is an isometric mineral, it does not exhibit double refraction.
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