snow crystal

A snow crystal is so fragile that it is easily mutilated by the wind and by contact with other crystals.

While waiting for the response he picked up a pencil from my pen-tray, and idly drew a snow crystal on the big desk-blotter.

But her slender finger pointed only to the snow crystal that Rivers had drawn.

On the face of it, it would seem as if Case Rivers must have drawn this figure of a snow crystal.