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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Home » Chemistry » 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.