GEOS 306 Midterm: GEOS 306 University of Arizona Midterm 1 2011
31 Jan 2019
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There are two common ionic states for sulfur, one as an anion, and one as a cation. Give the valence and make spin diagrams for these two states: (10 pts) derive the radius-ratio rule parameter (r. = . 414) for an octahedral 6- coordinated cation. Draw a picture and carefully label everything so that your answer can be evaluated properly. A: (15 pts) list 7 common types of bonding found in minerals along with a short description and an example of each, a) (5 pts) suppose the illustrated figures represent closest-packed arrangements of anions. Identify the different locations where cations could be coordinated with 2, 3, Assuming the following radii, r(o) = 1. 30 , r(mg) = Bonus point: name the mineral: (5 pts) draw a schematic binary phase diagram for the isostructural rocksalt minerals lime cao and periclase mgo. One melts at ~2570 c and the other at ~2950 c.
