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4200LFCTK_F10 - Fill-Ins Write in the word or words which...

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GLY 4200C Name 14 points December 2, 2010 8 students took exam Numbers to the left of the questions (in red ) are the points missed. LAB FINAL EXAMINATION Closed Notes True-False - Print the letter T or F in the blank to indicate if each of the following statements is true or false. Illegible answers are wrong. (1 point each) 0 T 1. In parallel extinction, J = 0°. 0 F 2. Twinning can be observed only under plane polarized light. 1 T 3. 3° red is higher than 3° blue. 1 T 4. Albite twins may appear wedge-shaped (thicker at one end) if the twinning results from deformation. 6 F 5. Carlsbad twinning is a type of polysynthetic contact twinning. 0 F 6. Interference colors are seen only in plane polarized. 0 T 7. Minerals with a very high, or extremely high relief always have the index of refraction greater than the mounting medium. 1 T 8. Inclined extinction is possible only in biaxial crystals. 2 T 9. Along an "optic axis" in an anisotropic substance light will behave isotropically and a grain will remain in extinction between crossed nicols.
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