Slowly the crystals began to glow, then to vibrate slightly.

First one crystal began to glow, then the other.

Although the crystals might begin to dissolve in the water, he feared that the weight of his arm would first sink him to the bottom.

The crystal at his belt began to tremble and shake.

If dropped on the ground and there's space adjacent to them, the crystals will begin to multiply into more, which can then be picked up.

This usually occurs when two crystals begin growing separately and then meet.

The black crystal began to shine with an eerie, grayish light.

The crystal surrounding him began to cloud and crack, like ice in shadow on a warm day.

Other crystals began to hum; the ground floor of the mountain rumbled.

In a fraction of a nanosecond, the whole crystal begins to conduct.