crystal twinning
twin crystal

The reverse process however is not entirely homogeneous and crystal twinning occurs.

Crystal twinning is common and adds complexity to the observed crystal habits.

Crystal twinning is common in cassiterite and most aggregate specimens show crystal twins.

Crystal twinning is common.

Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner.

Crystal twinning is common in feldspars, especially polysynthetic twins in plagioclase and Carlsbad twins in alkali feldspars.