I've been examining the properties of certain superdense crystals,' said Jeremy.

The spider manifests itself in Lupton's head, telling him to seek out and locate a certain blue crystal.

Hunter also differentiated between organic and inorganic growth, such as in certain crystals.

Fifteen hundred years ago another Avatar discovered the link between certain crystals and sunlight.

The interior contains certain crystals in a matrix.

But throughout all the sample he saw certain infinitely tiny crystals.

He wore a stake-belt next to his skin, and in it he had certain small crystals.

In certain crystals, and with compression acoustic waves, some of these nine elements may be zero.

When certain crystals, salt, for example, or sugar, are placed in water they dissolve and disappear.

Piezoelectric effect - Ability of certain crystals to generate a voltage in response to applied mechanical stress.