Cleusonite is seen as a black opaque cm-sized tabular crystal with a bright sub-metallic luster.

It occurs as opaque, yellowish to silvery microscopic Cubic (crystal system) crystals.

The globe itself was made of some purplish crystal, almost opaque.

Tahir gestured over his viewglobe, and the opaque crystal seemed to clear slightly, purple shadows moving stiffly in its depths.

Raistlin peered into the tube, saw that opaque brown crystals had formed on its inner surface-the proper result.

It occurs as disseminated microscopic subtranslucent to opaque octahedral crystals with a refractive index of 2.0 to 2.2.

Now it looked as if it were made of the same opaque white crystal Idalia had always used for her keystones.

Along the wall before Nezrene, other displays were active, also ensconced within another slab of the enigmatic opaque crystal.

Val Con reached up and pressed it, fighting the desire to lean forward and let the opaque crystal of the hatch hold him up.

Cadmoselite crystallizes in the hexagonal system and occurs as black to pale grey opaque crystals and grains.