Unit 9 Lesson 1 What Are Minerals? · PDF file09.10.2017 · Unit 9 Lesson 1 What Are Minerals? Copyright © Houghton Mifflin Harcourt Publishing Company Which Mineral Is Which? Unit

Unit 9 Lesson 1 What Are Minerals?

Copyright © Houghton Mifflin Harcourt Publishing Company



What Are Minerals?

• A mineral is any nonliving solid that has a crystal form.

• All minerals form in nature.

• There are more than 4,700 different kinds of minerals found on Earth.

9.1 images/mineral.PNG

9.1 videos/What Are Minerals - Types, Properties Examples - Video Lesson Transcript Education Portal.mp4



Classwork 1 Question: 1

Circle the picture that is most likely to be a mineral:


What Are Minerals?



What Are Minerals?

• Mineral crystals come in different shapes, but all particles in a crystal combine to form a shape that is repeated.

• The repeating structure of the particles forms the mineral crystal.



What Are Minerals?


Classwork 1

Question: 2

Make a tick for the sentences that are right about minerals:

1- Minerals are human made. ( )

2- Each mineral is made of the same set of elements . ( )

3- Particles in a mineral combines to form a crystalline form . ( )


Which mineral is which?

• Different physical properties can help you identify minerals?

• Hardness is one property used to identify minerals.

• Hardness is the ability of one mineral to scratch another mineral.

• The Moh’s scale is used to describe the hardness of a mineral. The softest minerals score 1 and the hardest minerals score 10.


9.1 videos/Mineral Hardness Test - YouTube.mp4


Which Mineral Is Which?





Classwork 1

Question: 3

-Write down the mineral that is softer than diamond and

harder than feldspar , yet it can be scratched by topaz:

___________________________ .



• Luster :is another property used

to identify minerals. It describes how minerals reflect light.

• The minerals copper, gold, and silver have a metallic luster.

• Talc and gypsum have an earthy luster.

• Some minerals have a glassy luster.





Classwork 1

Question: 4


Unique Properties of Minerals

• The way a mineral breaks can also be used to identify it.

• When minerals break, the broken sides are smooth and straight(1 ,2,3 or 4 surfaces). Minerals that break this way have cleavage.

• Minerals that do not break along smooth lines have fracture.


9.1 videos/fracture and cleavege trimmed.mp4



• The color of a mineral’s streak can also be used to identify it.

• Streak is the color of a mineral when it is rubbed against a white tile.

• A streak can be the same color as the mineral itself. This is not true for many minerals. Pyrite has a gold color, but its streak is greenish-black.


9.1 videos/Mineral Streak Test - YouTube.mp4



• A mineral can come in different colors, such as corundum crystals. However the streaks of these crystals are always white.

• Some minerals have other properties that can be used to identify them.

• For example, calcite and fluorite glow under a black light. Calcite fizzes when you drop vinegar on it. Quartz conducts electricity.





Classwork 1

Question: 5




Classwork 1

Question: 6




Classwork 2

Question: 1




Classwork 2

Question:

2a

2b

2c

Documents

Unit 9 Lesson 1 What Are Minerals? · PDF file09.10.2017 · Unit 9 Lesson 1 What Are Minerals? Copyright © Houghton Mifflin Harcourt Publishing Company Which Mineral Is Which? Unit