Mineralogy and Petrology I Geology 2311Exam: 50 minutesOctober 1, 2001Name _______________________________Answer five of the following seven questions. Each question is worth 10 points. If you spend an averageof one minute per point on each question, you will have 10 minutes left to check your work. Please timeyourself.1. Describe the physical properties of minerals that you use for identification? Use galena as an examplewhen describing the properties.2.. Write an essay on solid solution. Your answer should include what it is, what determines if it takesplace, the different kinds of solid solution, what physical properties change with solid solution, and ifappropriate examples of the above.3. Recalculate this analysis into the formula for a mineral.Weight % Molecular weightCaO 28.6 56.08TiO240.7 79.9SiO230.6 60.09Please show all your work.4. What kinds of polyhedral units are present in crystals? How do we predict which might occur? Pleaseuse examples when you answer this question. (Remember to invoke CN and radius ratio.)5. Rauchite is a new mineral that has recently been described in the literature. Is is pale yellow in colorand it has a beautiful gem variety. It usually occurs as a square prism with a basal pinacoid. Draw this. What symmetry elements are present? It has the following cell parameters: a=5 , c = 15At what distances will the (221) face cut the crystal axes?6. Define the following terms. Give examples of minerals where applicable. An example of a definition.Acicular: Acicular is a type of mineral habit. A mineral that has an acicular habit is long and needle-like. Tourmaline typically has this habit.a. Isometricb. Unit Cellc. Minerald. Euhedrale. Formf. Orthorhombicg. Dodecahedron.h. Miller Indexi. Botryoidalj. Triclinic7. The following are stereograms that show orthorhombic 2/m2/m/m symmetry. I have plotted the (111)face and the (110) face. Please show the replication of the faces. What forms will be produced byeach face? Are they open or closed
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