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Interaction of polarised light with minerals:LAB TS-1:Double refractionReliefColour and pleochroismOther properties that can be observed in PPLLAB TS-2:Isotropy and anisotropyBirefringence and interferenceExtinction angleSign of elongation. Nesse, 2000; Fig. 7.4. Polarisation. unpolarised light(all possible vibration directions).
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1. Optical Mineralogy Minerals in Cross-Polarised Light