Isotropic vs. Anisotropic Minerals

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$Math 361 Problem Set #5 Due 5 October 2012 - Faculty web pages$

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Clinopyroxene • Simple twin on {100} Plagioclase • Simple (Carlsbad) twin • Polysynthetic albite twins • Pericline twin Twinning
All uniaxial minerals (tetragonal, hexagonal) show parallel extinction. Quartz, calcite, apatite, zircon and tourmaline are uniaxial. Orthorhombic minerals show parallel extinction. This is because crystallographic axes and indicatrix axes coincide. Orthopyroxene PPL Parallel Extinction X-nicols
Page 1 and 2: Isotropic vs. Anisotropic Minerals
Page 3 and 4: Color vs. Pleochroism Color is obse
Page 5: No cleavage - Olivine
Page 9 and 10: Anhedral/irregular Blocky/elongate
Page 11 and 12: Fibrous Elongate/ Prismatic Tabular
Page 13 and 14: Calcite 320x Fine and Coarse-Graine
Page 15 and 16: Quartz 320x X-Nicols 1° white-gray
Page 17 and 18: Tourmaline 320x in PPL 45° off-ext
Page 19 and 20: Biotite 320x X-Nicols Birds-eye ext
Page 21 and 22: PPL Olivine 320x X-Nicols

Isotropic vs. Anisotropic Minerals

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