The Study of Minerals


*Use upload for pictures


1. Name the physical property (hardness, color, streak, etc.) described by each of the following statements.

DESCRIPTION:                                             PHYSICAL PROPERTY:

Breaks along smooth planes: ___________________________________

Scratches glass: _______________________________________

Shines like metal: __________________________________

Scratching produces a red powder: _____________________________

Looks like broken glass: ______________________________


2. What term is used to describe the shape of a mineral that has three directions of cleavage that intersect at 90-degree angels?   _______________________________


3. Describe the cleavage fo the minerals listed below. include the number of directions and degrees of cleavage angles (if appropriate).

MINERAL:                   CLEAVAGE:

Muscovite:   _____________________

Calcite: _______________________

Halite:  ______________________

Feldspar: _____________________


4. What physical feature most distinguishes biotite mica from muscovite mica? __________________________


5. Name a mineral that exhibits the physical properties listed below. (use the Photos in the upload, if needed)

PROPERTY:                           MINERAL:

One direction of cleavage: ________________________

Striations:    ________________________

Multiple Colors: __________________

Cubic cleavage: ______________________

Nonmetallic, vitreous luster: ______________________

Fracture: _____________________

Metallic luster: _____________________


6. Figure 1.32 illustrates the common crystal form of the mineral fluorite and the characteristic shape of a cleaved sample of fluorite. Identify each specimen (A or B) next to its appropriate description below. 

Cystal form of fluorite: ____________

Cleavage specimen of fluorite: ___________


7. Refer to the photo in Figure 1.33 to complete the following.

       a. Describe the crystal form (habit) of this specimen.


       b. What term is applied to the lines on this sample?


       c. Based on what you can determine from this photo, use the mineral identification key (see figure 1.24) to  

           identify this mineral. 



8. A photo of agate, a variety of quartz composed of microscopically small crystals, is provided in Figure 1.34. Based on this image, describe the habit of this sample.




9. If a mineral can be scratched by a penny but not by a fuman fingernail, what is its hardness on the Mohs scale?



10. What term is used to describe the tenacity of muscovite?



11. Use the mineral identification key (see Figure 1.24) to identify a mineral that is nonmetallic, dark colored, harder than glass, lacks cleavage, and is green in color.   _________________________________


12. For each mineral listed below, list at least one diagnostic property. 


Halite:     ______________________________________

Galena:   ______________________________________

Magnetite: _____________________________________

Muscovite: _____________________________________

Hematite: ______________________________________

Fluorite: _______________________________________

Talc:  _________________________________________

Graphite: ______________________________________

Calcite:  _______________________________________


13. List the two most common rock-forming mineral groups.




14. Providean economic use for each mineral listed below.

Galena: _______________________

Hematite: _____________________

Graphite: ______________________

Sphalerite: _____________________

Gypsum: ______________________

Calcite: _______________________

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