Your wish, my command...
crystallos knew it was called a weather-viewer, a favorite of headmaster ga'ould the gold. headmaster, yes, it was crystallos's duty as head servant to clean this particular room, and the honor was reserved for him.
The Manimal Chronicles #8: The Exile
It is undoubtably powered by crystallos shards—probably two of them." "will these shards be in beta dome?" i asked. "no, they must be kept well apart so their resonances do not interfere with each other."