Page Summary: The Scale: Fingernail (H ≈ 2.5) Copper Coin (H ≈ 3.5) Metal Nail (H ≈ 5.5) Knowing your
Mineral Hardness Tests -
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- The Scale: Fingernail (H ≈ 2.5) Copper Coin (H ≈ 3.5) Metal Nail (H ≈ 5.5) Knowing your
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