What physical feature most distinguishes biotite mica from muscovite mica? ______

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.

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