1. Add to Table of Contents:
Moh’s Hardness Scale Pg. 78 Properties of Minerals Pg. 79

2. Physical Properties of Minerals Pg
Physical Properties of Minerals Pg. 79 (can be used to identify the mineral)
1. Color- Can be misleading Can vary with the type of impurities

3. Physical Properties of Minerals (can be used to identify the mineral)
2. Luster- Surface reflection of light metallic = shiny like metal non-metallic = dull or reflects light(but not like metals)
Pyrite has a metallic luster
Calcite has a non-metallic luster

4. Physical Properties of Minerals (can be used to identify the mineral)
3. Streak-The color of the powdered form of the mineral. The color of the streak can be different than the mineral. Minerals must be softer than the streak plate.

5. Streak…can help identify quartz
BUT...

6. Physical Properties of Minerals (can be used to identify the mineral)
4. Cleavage The way the mineral breaks
& Fracture
Cleavage—minerals break along smooth, flat surfaces.
Fracture—minerals that break at random with rough or jagged edges.

7. Cleavage or fracture?

8. Cleavage or fracture?

9. Physical Properties of Minerals (can be used to identify the mineral)
5.Hardness- How easily a mineral scratches materials(or resists being scratched)
Mohs Hardness Scale
Scale from 1 (softest) to 10 (hardest)
Test by seeing if the mineral can scratch different objects (like human fingernail, copper penny, glass, steel file)

10. Answer essential question

11. Turn to page 28
Copy the following chart.

12. Name Color 1.Hematite 2. Pyrite 3. Graphite 4. Gypsum 5. Halite
Luster
Streak Color
Cleavage or Fracture
Hardness (1-10)
1.Hematite
2. Pyrite
3. Graphite
4. Gypsum
5. Halite
6. Calcite
7. Selenite
8. Apatite
9. Quartz
10.Muscovite
11. Olivine
12.Microcline

13. View minerals and identify their properties.