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Question: you just purchased a marble kitchen countertop marble is a...

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You just purchased a marble kitchen countertop (marble is a metamorphic rock formed when limestone is buried and heated; it’s made mostly of the mineral calcite). You have four choices of cleanser to clean it without leaving scratches: The expensive stuff containing real rubies, the supermarket brand containing orthoclase feldspar, talc powder from the baby’s room or the (also expensive) stuff sold by your kitchen contractor made of ground-up toenails from European Royalty. Which do you choose and why (use Mohs Hardness Scale to justify your answer)?

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