Crystals of iodine as opposed to permanganate of potash for antiseptic he discussed.
Crystals of frost puffed out as the water vapor left the air.
"Crystals," Rawson tried to tell himself, but he knew they were not.
From this it was only a step to the earth's strata, fossils, crystals—a fresh lecture.
These crystals gradually cover and enclose the active material.