Look at the table shown below.Hardness TestsMineral Can be Scratchedby a Fingernail? Can be Scratchedby a Penny?quartz no nocalcite no yestalc yes yesgraphite yes yesWhich mineral in the table has the greatest hardness? A. calcite B. talc C. quartz D. graphite
Question
Look at the table shown below.Hardness TestsMineral Can be Scratchedby a Fingernail? Can be Scratchedby a Penny?quartz no nocalcite no yestalc yes yesgraphite yes yesWhich mineral in the table has the greatest hardness? A. calcite B. talc C. quartz D. graphite
Solution
The mineral with the greatest hardness in the table is quartz. This is because it cannot be scratched by either a fingernail or a penny. The hardness of a mineral is determined by its resistance to scratching. The harder the mineral, the more resistant it is to scratching. Therefore, since quartz is the only mineral in the table that cannot be scratched by either a fingernail or a penny, it is the hardest mineral in the table.
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