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lee jae jun

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What is the hardness of emeralds or sapphires

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how many mineral is in the earth

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what is the hardness of a rock that it can be scratched by fingernail?

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Is Mr.Scott made of mineral?

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lee jae ju

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What is the second strongest mineral on earth?

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Jung on young

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what is the strongest rock on Earth?

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Who is the first person find minerals?

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how many minerals are in the rock?(usually)
what are some mineral that is hard to find?

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Why diamond is the most strong mineral

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Possible question

1. What is mineral?
2.what are the things that contains minerals in our lives?
3. Tell one kinds of luster

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Questions about 'Moh's Hardness scale'
- Writing number

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There are only one kind of streak-O/X

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rocks can only have one mineral -O/X

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haw mant mineral is in the rock?

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what is and example of materials used to identify the hardness of a rock?

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What is the hardness scale?

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what does property means?

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what do you think is the most beautiful minerals? (share your thoughts)

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what is mineral

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lee jae jun

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what does streak do?

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Is the luster of this mineral pearly or metallic?

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What is a mineral? What is a rock?

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who made the hardness scale?

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what is difference between cleavage  or fracture?

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what is difference between cleavage  or fracture?

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lee jae jun

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What is the difference between mineral and chrystal?