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Bell work 9/18/2017 GET YOUR COMP BOOK!

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Presentation on theme: "Bell work 9/18/2017 GET YOUR COMP BOOK!"— Presentation transcript:

1 Bell work 9/18/2017 GET YOUR COMP BOOK!
Mineral Breakage Observe the picture below then decide if it shows fracture or cleavage. Cleavage

2 Let’s Review… Fracture or Cleavage?

3 Let’s Review… YES Does it have luster?

4 Density Streak Hardness
Identifying Minerals Density Streak Hardness

5 Today’s Goals… Describe streak. Recognize the hardness of a mineral.
Explain how streak and hardness can be used to identify an unknown mineral.

6 DENSITY… Density = mass/volume
Density is how closely packed together atoms are in a given volume of space. Density is the amount of matter you have to fill in a specific space. When there is more matter in a given space, it is more dense. Density = mass/volume

7 Observe the DENSITY column below:
Rubbing Alcohol Vegetable Oil Toy Block Water Maple Syrup Marble

8 What is streak? On your foldable… Streak is the color of the powder of a mineral.

9 What is hardness? On your foldable… Hardness is a measure of the ability of a mineral to resist scratching.

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12 Hardness Test Lab: Try to scratch all four minerals with your fingernail. Try to scratch a penny using all four minerals. Try to scratch all four minerals with a nail.

13 Which picture below shows streak?
D

14 Which is harder: Calcite or Topaz?


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