HON 225 October 15, 2014 Please print Quiz #5: 50 pts 1. (6 pts) What is the approximate diameter of the Earth? 8,000 miles 2. (6 pts) The core is divided into an inner and outer layer. What is the principle difference between these layers? They are both mainly Fe-Ni, but the inner core is a solid while the outer core is liquid. 3. (8 pts) Answer the following true or false questions. Please print clearly. a. F Feldspar is the primary mineral found in limestone. b. T Of the six major mineral classes, the only non-silicate is calcite. c. T Garnet is an example of an Fe-Mg-containing mineral. d. F Quartz is the most abundant mineral on Earth. 4. (14 pts) Silicates can form a variety of tetrahedral linkages through the sharing of oxygen atoms. Sketch the 1-D and 2-D types of silicate structures discussed in class give an example of each. Chains: forms needle-like minerals, e.g., asbestos Sheets): forms planar, flat minerals, e.g., mica or clay (kaolin) See class notes for sketches of the first two structures.5. (16 pts) Using the hardness kit and other materials provided, identify two of the three unknown minerals provided. Eight extra credit points are available if all three are correctly identified. 29 = halite 32 = magnetite 33 =
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