It is common to use crystals that are about 1 mm.

He could, however, ensure that his planet's crystals were never used against Kirk's people.

Three-dimensional crystals may one day be used in optical computers.

The crystals are used for an 'active seismic isolation system'.

Rare large crystals have also been used in jewelry.

At least two crystals (typically of the Adegan variety) are used in the energy chamber.

To absorb the energy produced by dancers, piezoelectric crystals are used.

Alternatively, small, valueless crystals of the desired product can be used.

Piezoelectric crystals are also sometimes used in mechanical filter designs.

The researchers will probably argue that this photonic crystal should only be used with very weak light fields.