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**6**

One Type of Asbestos

5. Silicates are the most important mineral group

Slide 54

Tectosilicates - Three-Dimensional Networks

Quartz Feldspars

5. Silicates are the most important mineral group

Slide 55

Making Sense of Crystals

6. Crystals are determined by mathematical rules called symmetry

Slide 56

All repeating patterns can be described in terms of repeating boxes

Slide 57

The problem in Crystallography is to reason from the outward shape to the unit cell

6. Crystals are determined by mathematical rules called symmetry

Slide 58

Which Shape Makes Each Stack?

Crystals are determined by mathematical rules called symmetry

Slide 59

Stacking Cubes

6. Crystals are determined by mathematical rules called symmetry

Slide 60

6. Crystals are determined by mathematical rules called symmetry

Slide 61

6. Crystals are determined by mathematical rules called symmetry

Slide 62

6. Crystals are determined by mathematical rules called symmetry

Slide 63

Some shapes that result from stacking cubes

6. Crystals are determined by mathematical rules called symmetry

Slide 64

Symmetry – the rules behind the shapes

6. Crystals are determined by mathematical rules called symmetry

Slide 65

Symmetry – the rules behind the shapes

6. Crystals are determined by mathematical rules called symmetry

Slide 66

The Crystal Classes

6. Crystals are determined by mathematical rules called symmetry

Slide 67

Take-Away Points

Chemical elements form in stars

Atoms bond by sharing electrons

Minerals are classified by their chemistry

Minerals can be identified by their physical properties = atomic structure

- Take-Away Points
- Composition of the Sun
- How Elements Form in Stars
- What are Planets Made of?
- Minerals are the Chemicals that make up the Earth
- Summary of Bonding
- Naming minerals
- Identifying Minerals
- Color
- Hardness
- Density
- Luster
- Cleavage
- Identifying Minerals
- Unit Cells

- Upcoming Classes
- Newton’s Laws of Motion
- Sensory and Motor Mechanisms
- Newton’s third law of motion
- Motion
- Simulation at NASA for the Space Radiation Effort
- Health Physics

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