7.7: Lab Exercise (Part B)

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Materials

Take out Minerals Bag 2 and lay the six mineral samples out on a white sheet of paper. It should appear like Figure 7.13. We will first examine cleavage and fracture, along with hardness, from these six samples, and will answer more questions about them later in the lab. Look closely at each of the minerals, using the hand lens to observe them. In this bag, you have the following minerals (not listed in order): Pyroxene, Muscovite Mica, Halite, Amphibole, Calcite, and Biotite Mica. They are numbered 7-12.

Part B

7. Sample 7: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes at 90°

d. 3 cleavage planes at 90°

e. 4 cleavage planes

8. Sample 8: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes not at 90°

d. 3 cleavage planes not at 90°

e. 4 cleavage planes

9. Sample 9: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes not at 90°

d. 3 cleavage planes at 90°

e. 4 cleavage planes

10. Sample 10: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes not at 90°

d. 2 cleavage planes at 90°

e. 4 cleavage planes

11. Sample 11: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes not at 90°

d. 2 cleavage planes at 90°

e. 3 cleavage planes

12. Sample 11: What is this sample’s hardness?

a. harder than glass

b. softer than glass but harder than nail

c. softer than nail but harder than copper

d. softer than copper but harder than a fingernail

e. softer than a fingernail

13. Sample 12: This sample has:

a. no cleavage (it fractures)

b. 1 cleavage plane

c. 2 cleavage planes not at 90°

d. 2 cleavage planes at 90°

e. 3 cleavage planes

14. Sample 12: What is this sample’s hardness?

a. harder than glass

b. softer than glass but harder than nail

c. softer than nail but harder than copper

d. softer than copper but harder than a fingernail

e. softer than a fingernail