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In the hood, take a piece of rock salt (NaCl), align a metal spatula parallel to one of its faces (e.g. perpendicular to the front

In the hood, take a piece of rock salt (NaCl), align a metal spatula parallel to one of its faces (e.g. perpendicular to the front face) and tap the spatula sharply with an iron ring. How does the crystal break? Explain.

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