GEOS 306 Midterm: GEOS 306 University of Arizona Midterm 2 2011
31 Jan 2019
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2nd 2011 midterm (100 pts: (10 pts) fill in the table that defines the shape and constraints of the unit cell parameters. 2: (30 pts) fill in the missing point group symbols and indicate the crystal system for the point groups on a given row. 3: (15 pts) from the microprobe analyses of a solid-solution mineral, the following oxide weight percents were measured. Bonus: name the solid-solution pair of minerals (5 points) (eg diopside-jadeite), or name the mineral (2 points), or name the mineral group (1 point). 4: (5 pts) write down the number of your model and define its point group symmetry. 5: (10 pts) one of the diffraction patterns below was recorded on a cubic mineral; the other is from a triclinic mineral. Identify which pattern is from the cubic mineral and give a reason for your choice. For a hint, think about the positions of the (100), (010) and (001) peaks.
