Mineralogy and Petrology I Geology 2311Exam: 1 hourOctober 11, 2000Name _______________________________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. What are the six crystal systems and how are they defined?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 13.8 56.08MgO 24.8 40.32SiO259.2 60.09H2O 2.21 18Please show all your work.4. Using a P-T phase diagram, explain polymorphism using an example (it could be hypothetical).Describe three kinds of polymorphism, and give an example of each.5. Youngite and Hovisite are two new minerals that have recently been described in the literature. Theyhave several common characteristics. They are both reddish-blue minerals that occur as square prismsterminated by a pyramid on one end and a pedion on the other. Draw what they look like.. To what crystal system do both these minerals belong ?( You don’t need a table of symmetry to figure this out.Hovisite has the following cell parameters: a=5 , c = 17 At what distances will the (221) face cut the crystal axes?6. Define the following terms. Give examples of minerals where applicable.a. Hexagonal prismb. Ore Mineralc. Aciculard. Euhedrale. Botryoidalf. Twinningg. Dodecahedronh. Coordination Numberi. Radius Ratioj. Center of symmetry7a. What is Bragg's Law? How do we use it in mineralogy?7b. Describe how you would identify a mineral using its physical properties. Use simple terms. Do it as ifyou were talking to a fourth-grade
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