# What is the difference between positive crystals and negative crystals?

Normally crystals ** do not have electrical
charge**.

A few types of crystals (e.g. quartz) will develop an electrical
charge **across** them when placed under mechanical stress. This
property is called piezoelectricity. But the positive and negative
charges are on opposite sides of one crystal, not on two different
crystals.

Perhaps you were actually thinking of something that has nothing to do with science or electricity when you asked this question.

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