GEOS 306 Midterm: GEOS 306 University of Arizona Midterm 2 2009
31 Jan 2019
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2nd 2009 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: (10 pts) make a careful drawing and derive bragg"s law for x-ray diffraction. 4: (10 pts) consider a crystal of forsterite with orthorhombic symmetry, a = 4. 762 , 5: (15 pts) from the microprobe analyses of a mineral, the following oxide weight percents were measured. 6: (5 pts) make a hypothesis of what the first mineral ever formed in the universe might have been, and give a brief reason for your choice. 7: (5 pts) write down the number of your model and define its point group symmetry, (5 pts) electron microprobes and scanning electron microscopes are not able to detect h, he, li, and be.
