Vocabulary Terms

You should be able to define the following terms.
 

Covalent Bond	Ionic Bond	Metallic Bond	Crystal lattice
Slip Plane	Slip System	Elastic limit	fracture
brittle	ductile	Point Defects	Line Defects
Planar Defects	Deformation Mechanisms	Microcracks	cataclasis
frictional sliding	Mechanical twinning	Kinking	Diffusion Creep
Volume diffusion creep	Grain boundary diffusion creep	Dissolution Creep	Dislocation creep
Dynamic recrsytallization	Annealing	Recovery	Recrystallization
Deformation Maps	Brittle-Ductile Transition

Concepts

You should be able to give short answers to the following questions:

1.) How are deformation mechanisms related to bond type and bond strength?

2.) Know figure 4.17, and be able to give a brief description of each type of deformation mechanism.

3.) Why are actual yield strengths of minerals much lower than theoretical yield strengths.

4.) What is the brittle-ductile transition and what determines its location in the crust?

5.) Why is quartz stronger than mica?

6.) Explain what controls the location of cleavage and fracture planes in minerals?

7.) How is bond strength related to bond length?

8.) Briefly, how does the presence of defects enhance a minerals ability to respond to an imposed stress field?