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Name
Class
Date
2-4 How do we identify minerals?
Lesson Review
Complete the following.
1. Place a check mark next to each mineral that you can identify easily by its color alone.
_________ a. pyrite
_________ b. gold
__________ c. calcite
_________ d. quartz
_________ e. malachite
__________ f. azurite
2. What is the difference between streak and color? _______________________________________________
___________________________________________________________________________________________
3. What are the two kinds of luster? _____________________________________________________________
4. What is meant by a mineral’s hardness? _______________________________________________________
5. Check the statements that are true for minerals on the Mohs’ scale of hardness.
________
a. The hardest mineral is diamond.
________
b. A mineral with a low number can scratch a mineral with a higher number.
________
c. As the numbers on the scale increase, the hardness of the minerals also increases.
________
d. Talc is the softest mineral.
________
e. A mineral with a high number can scratch any mineral with a lower number.
Skill Challenge
Skills: analyzing, classifying
Use the Mohs’ Scale of Hardness shown below to answer the questions that follow.
MOHS’ HARDNESS TABLE
Mineral
Hardness
1. Copper can scratch talc and gypsum, but it cannot scratch
fluorite. What is copper’s hardness? _______________________
Talc
1
Gypsum
2
Calcite
3
scratch? ________________________________________________
Fluorite
4
3. Quartz has a hardness of 7. Name two minerals that can easily
Apatite
5
scratch quartz. __________________________________________
Feldspar
6
________________________________________________________
Quartz
7
Topaz
8
Corundum
9
Diamond
10
2. Graphite has a hardness of 1.5. What mineral could graphic
4. The mineral azurite can barely scratch calcite and cannot
scratch fluorite. What is its hardness? ______________________
Concepts and Challenges in Earth Science, Teacher’s Resources CD-ROM
(c) by Pearson Education, Inc./Globe Fearon/Pearson Learning Group. All rights reserved.
Minerals and Their Properties: CHAPTER 2, page 6
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