Minerals grow outward from a central seed to fill the available space; their shape is controlled by the shape of their surroundings. After the animation is complete, click and drag each crystal to reveal its individual shape.

by Stephen Marshak

>>see: p.85

This animation shows the progressive growth and interlocking of mineral crystals as they cool from a melt. It illustrates how some minerals interfere with the growth of other crystals.

by Declan DePaor

>>see: p.85