Download Chapter Review – Minerals of the Earth`s Crust 7. On Mohs

Chapter Review – Minerals of the Earth’s Crust
7. On Mohs’ hardness scale, which of the following minerals is harder than quartz?
a. talc
c. gypsum
c. apatite
d. topaz
8. A mineral’s streak
a. is more reliable than color in identifying a mineral.
b. reveals the mineral’s specific gravity.
c. is the same as a luster test.
d. reveals the mineral’s crystal structure.
9. Which of the following factors is not important in the formation of minerals?
a. heat
b. volcanic activity
c. presence of ground water
d. wind
10. Which of the following terms is not used to describe a mineral’s luster?
a. pearly
c. dull
b. waxy
d. hexagonal
11. Which of the following is considered a special property that applies to only a few minerals?
a. color
c. streak
b. luster
d. magnetism
12. Which of the following physical properties can be expressed in numbers?
a. luster
c. color
b. hardness
d. reaction to acid
13. Which of the following minerals would scratch fluorite?
a. talc
c. gypsum
b. quartz
d. calcite
14. Using no more than 25 words, define the term mineral.
A mineral is a naturally formed, inorganic solid with a crystalline structure.
15. In one sentence, describe how density is used to identify a mineral.
Density is the measure of how much matter there is in a given amount of space, so the
density of each mineral will be different, helping you identify it.
16. What methods of mineral identification are the most reliable? Explain.
The methods of mineral identification that are the most reliable are streak and
hardness. Steak is the most reliable method since the color of a mineral’s streak on a streak
plate is not always the same as the color of the mineral sample. Unlike the surface of a
mineral sample, the streak is not affected by weathering. Hardness refers to a mineral’s
resistance to being scratched. Each mineral has a different hardness on the Moh’s hardness
scale.