REVIEW FOR FINAL EXAM - MINERALOGY ANSWERS

1. You have been given an unknown mineral called 'C'.

1. Determine its weight to the nearest tenth of a gram. To do this, examine Fig. 1 shown below. It shows the scales of a triple beam balance, calibrated in grams.

The weight is: 538.7 g

FIGURE 1

2. Next, determine the volume of mineral C to the nearest 10 cubic centimeters. To do this, examine Fig 2 shown below. Fig 2A shows the level of water in a graduated cylinder (calibrated in cubic centimeters) before the mineral is immersed. Fig. 2B shows the water level after the mineral is immersed.

The volume is 830-690 = 140 cc

 FIGURE 2A FIGURE 2B

3. Now, calculate the density of mineral C.

The density is 539/140 = 3.85 g/cc

4. Last, identify the mineral, using Table 1.

The mineral is siderite.

2. Both mineral X and mineral Y have the following properties:

• color = blue;
• density = 2.65 g/cc.
Consult Table 1 to answer these questions:

1. What two minerals might they be?

cordierite or quartz.

2. What test might distinguish them?

A test for hardness.

3. Mineral Q has the following properties:

• It scratches calcite and is scratched by orthoclase.
• It has no streak.
• Its density is less than 3.
• Its color is white.

Consult Table 1 to answer this question: What three minerals might it be?

heulandite

aragonite

apophyllite

Describe a specific test that could be applied to Q that might tell you (a) which of the three minerals it is, or (b) might tell you which of the three minerals it is not.

The test would be to: see if the mineral scratches fluorite (H=4).

Questions 4 to 10. Review the "What is..? and "What are..?" Lou-Lulu dialogs.