1GLY4200CName 90 pointsOctober 28, 201016 took exam - Numbers to the left of the question number in red are the number of incorrectresponses. Instructor comments are in blue. Florida Atlantic UniversityMINERALOGY -- MIDTERM 2 EXAMINATION KEYTrue-False- Print the letter T or F in the blank to indicate if each of the following statements istrue or false. Illegible answers are wrong. (1 point each)1T 1. If two ions have a similar radius, the ion with the higher charge enters the crystalstructure preferentially.1T 2. There is a definite chemical discontinuity between the lower mantle and the outercore.2F 3. The symbol [uvw] represents a Miller Index.1T 4. All pyramidal forms are open0F 5. The symmetry of an octahedron compressed along the z axis will be higher than thatof a regular octahedron.0T 6. Magnetic separation is used in both laboratory and commercial scales for mineralseparation. 1T 7. Aircraft towing magnetometers are sometimes used for remote sensing of large areas,in the hopes of finding deposits of sulfide minerals, which may be economically valuable. 1F 8. High-spin Fe3+is smaller than low-spin Fe3+.1F 9. Net magnetic moments are generated only in atoms or ions with complete electronicshells.2T 10. The blue color in minerals such as kyanite, glaucophane, crocidolite, and sapphire isthe result of a ferric to ferrous charge transfer. 2F 11. Contact twins have an irregular composition surface separating two individualcrystals.0T 12. When twinning occurs in minerals of low symmetry, it may cause the mineral toappear to possess more symmetry than it actually does.
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