Istjärna

Istjärna is a Swedish term that translates to "ice star" or "ice crystal." It commonly refers to the crystalline structure of ice, particularly when observed in its natural formation, such as snowflakes or frost. The formation of these intricate patterns is a result of water molecules arranging themselves in a hexagonal lattice structure as they freeze. The specific shape and size of an ice star depend on various atmospheric conditions like temperature and humidity during its formation.

The hexagonal symmetry is a fundamental characteristic of ice crystals, leading to the six-pointed symmetry seen in most snowflakes. While often used interchangeably with snowflake, "istjärna" can also encompass other frozen water formations exhibiting a star-like appearance, such as certain types of ice needles or stellar dendrites. The study of these ice formations falls under the fields of crystallography and atmospheric science, with a particular interest in understanding the physics of cloud formation and precipitation. Historically and culturally, the beauty and ephemeral nature of ice stars have inspired art, literature, and scientific inquiry, symbolizing winter and natural phenomena.