First, not all snowflakes are perfectly symmetrical. In fact, the vast majority of snowflakes are asymmetrical. However they appear to be because on a microscopic scale, each side of a crystal being is such close proximity to the other will produce similar results because each molecule was formed under the same environmental conditions simultaneously.
Frozen precipitation in the form of white or translucent hexagonal ice crystals that fall in soft, white flakes.
snow
No.....No two snow flakes are exactly alike. They all have something unique about each and every one of them. There are similar shapes - 3 and 6 sided - and theoretically, you could have many of the same shape. That would be if they fell in the same manner, encountering the same amount of dust and moisture. See attached links.
Snow flakes
Solid white flakes of water that fall from the sky are called snow. Snow forms when water vapor in the atmosphere freezes into ice crystals, which then clump together to create snowflakes. These flakes can accumulate on the ground, creating a layer of snow. Snow is commonly associated with cold weather and winter conditions.
Frozen precipitation in the form of white or translucent hexagonal ice crystals that fall in soft, white flakes.
Snow flakes are made from water vapor in the air that combine to make little ice crystals. The ice crystals like to be in hexagonal forms, and make flakes.
It is estimated that there are trillions of possible variations for snowflake shapes due to the unique arrangement of water molecules as they freeze. Each snowflake is believed to have a one-of-a-kind design.
The water vapour forming snow has to reach 0oC to form ice crystals. There is no lower temperture for the snow formation. Interestingly the snow crystals formed are of different shapes as the temperture is lowered and the location of the formation occurs. Six-sided hexagonal crystals are shaped in high clouds, needles or flat six-sided crystals are shaped in middle height clouds and a wide variety of six-sided shapes are formed in low clouds. At colder temperatures the flakes have sharper tips on the sides of the crystals and more branching of the snowflake arms. Snowflake shapes at various (approximate) formation temperatures are: -16° C - Thin hexagonal plates -10° C - Needles -8° C - Hollow columns -5°C - Sector plates (hexagons with indentations) -2°C - Dendrites (lacy hexagonal shapes)
A hexagonal prism consists of two hexagonal bases and six rectangular faces. The hexagonal bases are the two parallel shapes at the top and bottom, while the rectangular faces connect the corresponding sides of the hexagons. Thus, the two-dimensional shapes present in a hexagonal prism are hexagons and rectangles.
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Two hexagonal "ends" and six rectangular sides.
Square
Snow is frozen water vapor that falls to Earth as flakes.
Lacy flakes of frozen water are snowflakes. Snowflakes form when water vapor in the air condenses and freezes into intricate ice crystals, creating the unique shapes and patterns we see falling from the sky.
Hexagon. Hexagonal prism. Hexagonal pyramid. Hexahedron.
Snow flakes.