GEOL 311: Mineralogy LAB 2: Crystallographic Symmetry – Assignment Due: Week of September 17th, 2018 Student Name ……………………………………………………. AIMS AND OBJECTIVES OF LAB 2 – Learn to examine crystals and become familiar with their respective systems and symmetry Assignment Crystal Systems Crystal Symmetry Total Grade /10 /10 /20 A. Crystal Systems (10 points) To the best of your ability, draw and label the defining components of each crystal system. Describe the axis (a,b,c) and angle (α,β,γ) relationships. Points are awarded for correct content, not artistry. List one or two minerals in each system. 1) Isometric 2) Orthorhombic 3) Tetragonal 4) Monoclinic 5) Hexagonal 6) Triclinic B. Symmetry (10 points) In this section, we will work on symmetry operations. Complete the table below by visually inspecting the provided crystal models, assessing their symmetry content recording that content in Hermann-Mauguin (H-M) notation, and determining the crystal system and shape name. # 428 367 30 32 478 156 90 276 480 Symmetry Content H-M Symbol Crystal System Shape NameThe locations of entisols in figure 2 are shown in an aqua blue color. What one or two other soil type(s) appear to be found along with entisols? 8.1. Look at table 2 for the descriptions to the soils from your answer to question 8 above. Does it make sense that they would all be found alongside entisols? Why or why not and what climate region are these soils typically found? 8.2. Using the given latitudes in figure 2 circle the combination of latitudes below that best describes where the majority of entisols seem to occur. A. 30°N and 60°N C. 15°N and 45°N B. 15°N and 15°S D. 15°S and 45°S 9. Ultisols are displayed in figure 2 in yellow. What are the one or two other soil type(s) that can be found along with ultisols? 9.1. Look at table 2 for the descriptions to the soils from your answer to question 9 above. Does it make sense that they woulll be found alongside ultisols? Why or why not and what climate region are these soils typically found? 9 9.2. Using the given latitudes in figure 2 circle the combination of latitudes below that best describes where the majority of ultisols seem to occur. A. 30°N and 60°N C. 15°N and 45°N B. 15°N and 15°S D. 15°S and 45°S 10. Based on figure 2 mollisols and alfisols form together. The latter is the State soil of California. Does this make sense based on their descriptions in table 2? Why are these soils important to you as a human? 10.1 Describe where in North America these soils form (i.e., are they only in the US?). Where are the closest mollisols and alfisols to San Diego? What does that mean about where we most likely get our food? 10 Use figure 3, below to answer question 11 – 14. Figure 3: World map displaying arid regions in brown and tan, wet regions in dark green, and ice in white. Labeled on the left side of the map are notable lines of latitude, the equator at 0°, 30°N and S, and 60° N and S for reference. Note that each line of latitude equals 15°. 11. In figure 3 arid regions are shown in tan and light brown. Circle the latitudes below that best describe where the majority of arid regions occur on Earth. A. 30°N and 60°N C. 15°N and 45°N B. 15°N and 15°S D. 15°S and 45°S 11.1 Does your answer to question 11 match your answer to question 8.2? 11 12. In general, when people refer to the ‘tropics’ they mean the area around the equator. In figure 3 wet regions are shown in dark green. Circle the latitudes below that best describe where the majority of tropical (wet) regions occur on Earth. A. 30°N and 60°N C. 15°N and 45°N B. 15°N and 15°S D. 15°S and 45°S 12.1 Does your answer to question 12 match your answer to question 9.2? 13. Notice that there are wet regions found on Earth other then those found at the equator. Take a moment to locate these in figure 3. With these locations in mind look at figure 2. What soil type (entisol, ultisol, or mollisol) is located here? 14. In three or four sentences summarize where on Earth entisols, ultisols, and mollisols occur. You should use words like, arid regions, tan, wet regions, green, and latitude. 15. Why should you care about mollisols? 12

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