Crystallography form definition

  • What is a crystallographic form?

    form, in crystallography, all crystal faces having similar symmetry.
    Those forms that enclose space are called closed forms; those that do not, open forms..

  • For gemologists, the scientific definition of a crystal goes right to the atomic level.
    A crystal is a solid whose atoms are arranged in a "highly ordered" repeating pattern.
    These patterns are called crystal systems.
    If a mineral has its atoms arranged in one of them, then that mineral is a crystal.
  • In contrast with general forms, special forms are parallel to one or two crystal axes.
    This means they are parallel or perpendicular to rotation axes or mirror planes.
    Consequently, special forms contain fewer faces than general forms for the same crystal class.
  • This whole process of how crystals are made is called crystallisation.
    The crystals are generally formed when some type of liquid starts cooling down and ultimately creates a solid structure.
    This is the process of how crystals form in rocks.
    They mainly develop when liquid rocks like magma start to cool down.
crystal form in British English noun. crystallography. a symmetrical set of planes in space, associated with a crystal, having the same symmetry as the crystal class.
crystallography. form, in crystallography, all crystal faces having similar symmetry. Those forms that enclose space are called closed forms; those that do not, open forms.

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