1GLY4200CName 90 pointsOctober 26, 201116 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)0T 1. All mathematical groups, including crystallographic point and space groups, mustcontain an identity operation.2F 2. All pyramidal forms are closed.11F 3. As nuclei grow, their surface area/volume ratio increases. 1F 4. Growth twins are always penetration twins.2T 5. Low-spin Fe3+is smaller than high-spin Fe3+.0T 6.As pressure increases, minerals transform to denser structures, with atoms packedmore closely together1T 7. Although silicon normally has CN = IV, in the lower mantle the pressures are so greatthat the CN of silicon is VI.2F 8. If two ions have the same charge, the larger ion will enter a crystal structurepreferentially.2T 9. Crystal classes are defined by the thirty-two possible point groups.11F 10. Possible symmetry operations include rotation axes, mirror planes, and an inversioncenter. What is wrong with this statement?0T 11. Faces composed of all anions or all cations are very high energy. They attract ions ofopposite sign, grow rapidly, and may grow themselves out of existence.1T 12. The calculation of the zone axis is done using the same method as a vector cross-product.
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