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Exploring Earth's Jewels - An Introduction to the Properties of Minerals

Grade Level: 7th - 8th Grade

Duration: 1 Class Period (90 Minutes)

Objectives:

By the end of this lesson, your students will be able to understand the basic properties of minerals. They will identify minerals based on their properties. And they will recognize the uses of minerals in everyday life through hands-on activities.

Standards:

  • NGSS MS-ESS2-1: "Develop a model to describe the cycling of Earth's materials and the flow of energy that drives this process."

  • NGSS MS-ESS3-1: "Construct a scientific explanation based on evidence for how the uneven distributions of Earth's mineral, energy, and groundwater resources are the result of past and current geoscience processes." 

Materials:

  • Samples of various minerals (e.g., quartz, feldspar, calcite, mica)

  • Plain chocolate bar and a candy bar

  • Magnifying glasses

  • Streak plates

  • Mohs hardness scale kits

  • Glass plates, nails, pennies (for hardness testing)

  • Scratch test materials (e.g., ceramic tile, steel file)

  • Worksheet on mineral properties

  • Chart paper and markers

  • Identification Guides

Lesson Outline:

Introduction to Minerals (15 minutes)

Ask: To gauge your student's prior knowledge, ask the following questions: What are minerals? How do you think minerals are different from rocks?

Say: Minerals are elements that are naturally found in the earth. They are made up of one material or chemical compound. On the other hand, rocks are made up of many different materials packed tightly together. 

Show: Demonstrate the principle of rocks vs. minerals by showing them a chocolate and candy bar. Explain how the chocolate bar is entirely made of chocolate; that's it. The candy bar, on the other hand, might be made of chocolate, nuts, caramel, coconut, or other materials. But those materials are all pressed together, appearing just as solid as the chocolate bar. 

Discuss: Introduce the concept of minerals and their importance in daily life.

Show: Share examples of common minerals and their uses.

  • Quartz in watches

  • Calcite in cement

  • Iron in construction materials

  • Copper in plumbing

  • Slate in roof tiles

  • Limestone and clay in bricks

Exploring Mineral Properties (20 minutes)

Ask: What do you think "luster" is? Why would it matter when it comes to minerals?

Discuss: Explain and show examples of color and luster in minerals.

Show: Demonstrate how to perform a streak test using streak plates (see instruction video).

Say: Explain the Mohs hardness scale and demonstrate using glass plates, nails, and pennies. Talk about how the harder the mineral, the higher its number will be on the scale. Using the scale, geologists can test minerals they find in the field. 

Say: Describe and show examples of cleavage and fracture in minerals.

Do: Distribute mineral samples and magnifying glasses. Have students observe and record the color and luster of each sample. They should also perform streak tests and hardness tests and record their results.

Practical Uses of Minerals (10 minutes)

Discuss: Explain how minerals are used today in various industries and everyday items.

Show: Provide examples like toothpaste (calcite), electronics (quartz), and jewelry (various minerals).

Ask: What minerals do you have in your home?

Mineral Identification Lab (30 minutes)

Say: Today, you get to be a geologist. You're going to study the minerals we have here in class. Using your worksheets, you'll try identifying the minerals based on the different properties we've learned about. You can use the identification guides to help you decide which is which.  

Do: Set up lab stations with unknown mineral samples and identification guides. Have your students rotate through stations, performing tests (color, luster, streak, hardness, cleavage, fracture) and recording their observations. Using the provided worksheets, they can use the recorded properties to identify each mineral.

Conclusion and Reflection (15 minutes)

Ask: Now that you've studied these minerals, who can tell me one of the properties we can use to identify minerals?

Discuss: Review the key properties used in mineral identification. Reflect on the importance of careful observation and testing in scientific inquiry.

Share: Invite your students to share their identification results and any challenges they faced. 

Discuss: Talk about how understanding mineral properties would be useful in the real world.

Assessment:

Conduct student grading on the following criteria:

  1. Participation in discussions and hands-on activities.

  2. Completed worksheets and lab observations.

  3. Accuracy in identifying minerals during the lab.

Extensions (Optional):

If your class is ready for more, try the following assignments:

  • A short 1-page paper on a specific mineral and its uses.

  • Have your students bring mineral samples they find at home or outdoors to share with the class.

Written by Rachel Jones

Education World Contributor

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