Classifying rocks

Explain what are minerals.

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NGSS.MS-ESS3-1

Explain what are crystals.

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NGSS.MS-PS1-1

Can a mineral change materials of which it's made from a piece to another? Give examples.

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NGSS.MS-PS1-2

What does the Mohs Scale measure?

• How hard a rock is.

• How strong a rock is.

• How much light it reflects.

• The economic value of a rock.

What is luster? What are the three degree of luster?

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What is a streak? Can two rocks of a different color have the same streak? Give an example.

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What's the difference between cleavage and fracture?

• A cleavage is a break in the rock which results in smooth surfaces, while a fracture is a break that can go in any directions.

• A cleavage is a break in the rock which does not result in smooth surfaces, while a fracture is a break that does.

• A cleavage is the color of the rock, while a fracture is how shiny it is.

• A cleavage is when you can scratch a rock, while a fracture is when you can break it.

Which other properties can rocks have?

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