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snow crystals 
Ice crystals whose form depends on temperature and humidity; they fall separately or in agglomerations of flakes.
column
Short translucent ice crystal with flat extremities; it is prism-shaped and occasionally hollow.
plate crystal
Ice crystal in the form of a thin hexagonal plate that is occasionally hollow.
spatial dendrite
Ice crystal characterized by complex branches similar to those of a tree.
irregular crystal
Ice crystal with no defined shape resulting from the agglomeration of several crystals.
stellar crystal
Star-shaped crystal with six branches.
snow pellet
Opaque ice crystal less than 5 mm in diameter that froze inside a cloud.
sleet
Ice crystal less than 5 mm in diameter that results from rain drops or snow flakes freezing before they touch the ground.
hail
Hard, usually spherical ice crystal that varies between 5 and 50 mm in diameter; it is formed of concentric layers of clear opaque ice.
capped column
Ice crystal that is identical to the column, except for the thin hexagon-shaped cap at each extremity.
needle
Translucent prism-shaped ice crystal; it is long and narrow and has pointed ends.
