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:
Gold:
Plastic:
Oil:
Glacial ice:
Water:
Exercise 2: Properties of Minerals
QUESTION 2:
Which minerals included in the luster box have a non-metallic luster
? (4 points)
QUESTION 3:
Which minerals included in the luster box have a metallic luster
? (4 points)
QUESTION 4: Which mineral has a black streak? (3 points)
QUESTION 5:
Which mineral has a red streak? (3 points)
QUESTION 6:
Which two minerals shown in Figure 1 can be scratched by a fingernail? (2 points)
QUESTION 7:
Which three minerals shown in Figure 1 are softer than glass, but harder than a fingernail?
(3 points)
QUESTION 8:
Which mineral is the hardest (Mohs hardness = 10)? (3 points)
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)
QUESTION 10: Which minerals in the tray have only one direction of cleavage? (4 points)
QUESTION 11:
Which two minerals have three directions of cleavage? (4 points)
QUESTION 12
: Which sample has four directions of cleavage? (4 points)
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)
Exercise 3: Mineral Identification (50 points)
Sample
Metallic or
non-metallic?
Harder or softer
than glass?
Cleavage? If
so, how many
planes and
angles?
Other features?
(streak color, HCl
reaction, etc.)
Mineral Name
1
2
3
4
5
6
7
8
9
10
Exercise 4: Mineral Identification in Rocks
QUESTION 14:
Name two of the minerals in this rock. (Name only two minerals because you will lose points for each wrong mineral.) (4 points)
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