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Unformatted text preview: • Isotropic o Liquids, isometric minerals • Uniaxial o Hexagonal and tetragonal minerals • Biaxial o Orthorhombic, monoclinic, triclininc minerals Birefringence = Nslow- Nfast Birefringence = retardation / thickness 15:11 Readings for next class: 146-151 Refractive indexes in Optic Plane • Z- gamma axis pointed up (longest) • X- alpha axis pointed to side • Y- Beta pointed out towards you • 2 optic axes somewhere in optic plane • Bxa- splits acute angle, either Z or X Readings for next class: 74-81 15:11 Nucleation • Barrier to overcome • Free energy system (G) • 1 st step in decreasing minerals • reactants -> products • Delta G – G PRODUCTS – G REACTANTS • For spontaneous reaction need Delta G to be – Readings for next class- 186-190...
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- Fall '08
- Optical Crystallography, triclininc minerals Birefringence, lens Short wavelengths, Nslow Nfast Birefringence, isometric Anisotropic direction, relief Becke Lines