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9 January, 10:32

Monica found a clear mineral crystal. She wanted to identify its hardness. She tried to scratch it with her fingernail, a penny, and a steel nail but none of those worked. Then she tried topaz, which did leave a scratch. The mineral was able to scratch glass. What mineral could Monica have found? Explain your answer.

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  1. 9 January, 13:50
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    Quartz is the mineral
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