How can we identify a mineral or a rock ?
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Transcript of How can we identify a mineral or a rock ?
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How can we identify a mineral or a rock?
GPS S3E1b. Recognize the physical attributes of rocks and minerals using observation, measurement, and simple tests.
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…by its hardness
Talc is the softest mineral.
Diamond is the hardest mineral.
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Let’s do the hardness or scratch test!
• You will need: your fingernail, a penny, a concrete nail, different kinds of minerals, and the Mohs Scale of Hardness chart below.
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Bring out your rock and test its hardness by doing the scratch test!
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…BY ITS COLOR
This is the mineral talc.
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This rock called granite has 3 colors which means it has 3 kinds of minerals.
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But wait!!!
• We cannot identify all rocks and minerals just by looking at their color/s.
• Why? Can you tell which is gold and which is pyrite (fools gold)?
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So we need the other properties of minerals to help us identify them.
• Streak is another property. It is the color of the fine powder produced when a mineral is rubbed against a hard surface.
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Do your own streak test using your pet rock.
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…another property of mineral is luster.
• Luster describes how light bounces off (reflects) a mineral.
• Which is metallic and shiny and which is dull?
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The texture or the “feel” of a mineral depends on the size of its particles.
This mineral has very tiny particles. It has a smooth texture.
This mineral has big particles. It has a rough texture.
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The way to identify rocks and minerals is learning about their properties:
• Color• Streak• Hardness• Luster• Texture
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Let’s Review!
• Read pp. 124 and 125 of your book. Use the pictures to help you understand what you read.
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Now it’s your turn to identify your rock!
• Adopt a pet rock. • Fill out the chart. Make your pet rock “look good” by following the rubric.
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Rubric for your pet rock4 Points (100%) 3 Points (75%) 0
Student’s information is correct. He/she wrote in complete sentences.
Student’s information is correct. He/she did not write in complete sentences.
Student’s answer is wrong.