F05_Midterm_Practice - GEO 303 Lab Mid-semester Exam Fall,...

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GEO 303 Lab Mid-semester Exam Fall, 2005 Name _________________________________________ Lab meeting time (weekday/hour) __________________ TA _________________________ 8 pages, 100 points
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2 INSTRUCTION: Each question in this multiple-choice exam has only one correct answer, worth 1 point. Bubble in the correct responses using the provided answer sheet. If more than one answer is correct, choose the best (most inclusively correct) answer. PART I: 40 points. These questions pertain to samples 1 through 40 in numbered trays. MINERALS 1. Identify this mineral. (A) kaolinite; (B) potassium feldspar; (C) plagioclase feldspar; (D) hematite; (E) augite. 2. All but one of the following statements are true of this mineral (muscovite). Which one is the exception? (A) This mineral has well-developed cleavage. (B) This mineral has a non-metallic luster. (C) Color is a useful property in identifying this mineral. (D) This mineral has a high density. 3. Identify this mineral. (A) hornblende; (B) biotite; (C) magnetite; (D) olivine; (E) kaolinite. 4. The hardness (on the Mohs scale) of this mineral (gypsum) is best described as: (A) less than 2.5; (B) between 2.5 and 4; (C) between 4 and 6; (D) greater than 6. 5. Identify this mineral. (A) kaolinite; (B) gypsum; (C) talc; (D) muscovite; (E) calcite. 6. All but one of the following statements are true of this mineral (halite). Which one is the exception? This mineral has: (A) 3 directions of cleavage; (B) a vitreous luster; (C) a hardness between 2.5 and 4; (D) rhombohedral cleavage. 7. Identify this mineral. (A) halite; (B) graphite; (C) calcite; (D) gypsum; (E) quartz. 8. Which one of the following statements best describes this mineral (quartz)? This mineral: (A) breaks with hexagonal cleavage; (B) breaks with conchoidal fracture; (C) has a pearly luster; (D) is a carbonate mineral. IGNEOUS ROCKS 9. Identify this igneous rock. (A) rhyolite; (B) scoria; (C) pumice; (D) peridotite; (E) obsidian. 10. Which one of the following pairs of words best describes this igneous rock (gabbro)? (A) felsic and extrusive; (B) mafic and extrusive; (C) felsic and intrusive; (D) mafic and intrusive. 11. Identify this igneous rock. (A) peridotite; (B) rhyolite porphyry; (C) gabbro; (D) granite; (E) andesite porphyry. 12. All but one of the following statements describe this igneous rock (obsidian). Which one is the exception? (A) cooled rapidly at the earth’s surface; (B) has a glassy texture; (C) has a felsic or intermediate chemical composition; (D) is composed of microscopic crystals of quartz. 13. Identify this igneous rock. (A) basalt; (B) gabbro; (C) scoria; (D) obsidian; (E) shale. 14. Which one of the following statements best describes the cooling history of this igneous rock (andesite porphyry)? (A) cooled rapidly at the earth’s surface; (B) cooled slowly underground in the presence of H 2 O; (C) cooled slowly underground and then the remaining liquid cooled quickly above ground; (D) cooled quickly underground and then the remaining liquid cooled slowly above ground.
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F05_Midterm_Practice - GEO 303 Lab Mid-semester Exam Fall,...

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