On top their blankets lay six inches of frost crystals.

Many glistened, edged leaf by leaf with delicate frost crystals.

White stuff - frost crystals, maybe - puffed in through the vent and left a powdery triangular shape on the wall.

The size of frost crystals varies depending on the time they have been building up and the amount of water vapour available.

They were carrying heavy metal containers of varying sizes, on which frost crystals were forming.

The walls were sheer blue ice, broken here and there only by a small ledge or a few frost crystals.

The walls of this tunnel were covered with frost crystals, which sparkled in the light.

Fast-growing frost crystals framed the claw in an ivory glow.

The snow fell gently through the pulseless air, not in flakes, but in tiny frost crystals of delicate design.

On top their blankets lay six inches of frost crystals.

Many glistened, edged leaf by leaf with delicate frost crystals.

White stuff - frost crystals, maybe - puffed in through the vent and left a powdery triangular shape on the wall.

The size of frost crystals varies depending on the time they have been building up and the amount of water vapour available.

They were carrying heavy metal containers of varying sizes, on which frost crystals were forming.

The walls were sheer blue ice, broken here and there only by a small ledge or a few frost crystals.

The walls of this tunnel were covered with frost crystals, which sparkled in the light.

Fast-growing frost crystals framed the claw in an ivory glow.

The snow fell gently through the pulseless air, not in flakes, but in tiny frost crystals of delicate design.