When melting snow-crystals or raindrops fall through very cold air, they freeze to form small particles of ice, called sleet.

VOA: special.2011.01.11

Clouds with extremely cool water are mixed with man-made ice crystals, such as silver iodide and metaldehyde crystals.

VOA: special.2011.01.11

It took him several weeks to learn how to string the crystals, and how to separate them so they would look nice.

VOA: special.2009.05.18

As many as one hundred crystals may join to form a snowflake larger than two and one-half centimeters.

VOA: special.2011.01.11

Snowflakes come in different sizes. As many as one hundred crystals may join together to form a snowflake larger than two and one-half centimeters.

VOA: special.2010.01.05

The song was released under the name of another Phil Spector group called the Crystals.

VOA: special.2011.03.21

Today the ball is larger and covered in more than two thousand crystals.

VOA: special.2009.12.28

All snow crystals have six sides, but they grow in different shapes.

VOA: special.2010.01.05

Snow crystals grow in one of two designs - plate-like and columnar.

VOA: special.2011.01.11

Fresh snow is made largely of air trapped among the snow crystals.

VOA: special.2010.01.05

Snow crystals grow in one of two designs platelike and columnar.

VOA: special.2010.01.05

It contains many groups of tiny ice particles called snow crystals.

VOA: special.2010.01.05

These crystals grow from water particles in cold clouds.

VOA: special.2010.01.05

Snow crystals have many surfaces to reflect sunlight.

VOA: special.2010.01.05

Columnar snow crystals look like sticks of ice.

VOA: special.2010.01.05

Ice crystals form on the leaf surface.

VOA: special.2010.01.12

Platelike crystals are flat.

VOA: special.2010.01.05

"little guide to different types of snowflakes sectored plates and capped columns and hollow columns and all different types of crystals.

VOA: standard.2009.12.19

"SnowCrystals.com is a website that is about snowflakes and snow crystals and generally ice phenomena,"

VOA: standard.2009.12.19

And I even have a section on what I call 'designer snowflakes,' which is us growing crystals in the lab,trying to understand how the physics works."

VOA: standard.2009.12.19