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Our rock looks like a crystal. |
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We can scratch our rock with a nail. |
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Our rock streaks white. |
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Our rock can not be scratched with a penny. |
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We can scratch our rock with our fingernail. |
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Our rock's length is 3 cm. |
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Our rock's circumference is 10 cm. |
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Our rock is transparent. |
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Our rock is glassy green. |