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Biaxial optics

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Biaxial optics

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    1. Biaxial optics Nesse, 1991 Chapter 7, page 77 to 108

    3. Biaxial Minerals Minerals in orthorhombic, monoclinic and triclinic specify length of unit cell along all three crystallographic axes Also specify three indices of refraction named a, b, and g (in book called na, nb and ng) Where na < nb < ng so maximum birefringence is ng- na

    4. Biaxial minerals 3 indices of refraction: na < nb < ng Light still broken into two rays, one fast & one slow Both rays are extraordinary Slow ray is always ng’, with ng > ng’ > nb Fast ray is always na’, with na < na’< nb

    6. Biaxial Minerals X-Y, X-Z, and Y-Z plane

    7. Biaxial Minerals The biaxial indicatrix has 2 circular sections with radius nb The 2 optic axes (O.A.) are perpendicular to these circular sections The angle between the 2 O.A.’s is called 2V Axis bisecting acute angle is acute bisectrix or Bxa Axis bisecting obtuse angle is obtuse bisectrix or Bxo

    8. Optic Sign?

    24. Determining the optical properties of an oriented mineral. Section (100), (010), and (001)

    28. Now you know which optical direction is parallel to the a, b, and c-axis With your interference figure you can estimate the 2V. Draw all the information on a block diagram

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