Sodium Chloride Crystal Cleavage
Here a small crystal of solid sodium chloride is shown. It is transparent and has 90-degree angles at the sides. When a knife blade is placed on it parallel to one side and tapped with a hammer the crystal cleaves into two pieces, each with a very clean plane edge. Now the piece that was cleaved off of the original piece is examined. The knife blade is placed on it at a 45-degree angle to a side and tapped with a hammer. The crystal shatters, but part of it cleaves parallel to a side.
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