STUDENT ANSWER SHEET Make Up Lab 3 Identifying Minerals

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Geology

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Feb 20, 2024

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Lab 3 Make Up- Identifying Minerals Student Answer Sheet Exercise 1: Definition of a Mineral QUESTION 1: Which of the following substances could be considered minerals? For each one that is not a mineral, explain why. (Hint: Use what you know about each of these substances and the definition of a mineral listed above.) (6 points) Salt: Salt is a mineral; it is formed from sodium chloride. It has a crystalline structure as well. Gold: Gold is a mineral; it is naturally occurring. Plastic: Plastic is not a mineral; it is not naturally occurring. It is made from carbon and hydrogen compounds unlike minerals. Oil: It is not considered a mineral by the definition. It is a liquid. Glacial ice: It is by definition; it also has a crystalline structure. Water: No it is a liquid, but when it becomes ice it is. Exercise 2: Properties of Minerals QUESTION 2: Which minerals included in the luster box have a non-metallic luster ? (4 points) Halite, Feldspar, Muscovite, Hornblende QUESTION 3: Which minerals included in the luster box have a metallic luster ? (4 points) Gypsum, Pyrite
QUESTION 4: Which mineral has a black streak? (3 points) Gypsum (?) While others have black, it has the most ‘streak’ like appearance. QUESTION 5: Which mineral has a red streak? (3 points) Hematite QUESTION 6: Which two minerals shown in Figure 1 can be scratched by a fingernail? (2 points) Talc, Gypsum QUESTION 7: Which three minerals shown in Figure 1 are softer than glass, but harder than a fingernail? (3 points) Apatite, Fluorite, Calcite QUESTION 8: Which mineral is the hardest (Mohs hardness = 10)? (3 points) Diamond QUESTION 9: Calcite and fluorite can sometimes appear similar. If you have a mineral sample but don’t know whether it is calcite of fluorite, how could you use hardness to determine which one you have? Be specific. (2 points) Fluorite ranks a 4, while calcite only ranks a 3. A copper penny is between them and would be the best tool to differentiate the minerals. QUESTION 10: Which minerals in the tray have only one direction of cleavage? (4 points) Muscovite, gypsum QUESTION 11: Which two minerals have three directions of cleavage? (4 points) Halite, calcite QUESTION 12 : Which sample has four directions of cleavage? (4 points) Fluorite QUESTION 13: The mineral quartz has no cleavage. The smooth planes you see develop naturally when the crystal forms. They are growth faces, not cleavage planes. Examine the sample of quartz and explain how you can tell that the smooth planes are not cleavage planes. (4 points) There are seemingly random fracture points rather than planes.
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