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Gurmeet Singh posted an Question
September 25, 2020 • 19:28 pm 30 points
  • IIT JAM
  • Geology (GG)

Sir. also explain these terms. please.

I 1S an assemblage of taces, which can enclose a volume ot sp lose a volume of space. (iii) (a) General Form : it is one in which the indices are unrestricted in magnitude. (b) Special Form: Here only one

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    Rahul kumar best-answer

    General form is a form in a particular crystal class that contains faces that intersect all crystallographic axes at different lengths. It has the form symbol {hkl}. All other forms that may be present are called special forms.  For example: In the monoclinic, triclinic, and orthorhombic crystal systems, the form {111} is a general form because in these systems faces of this form will intersect the a, b, and c axes at different lengths because the unit lengths are different on each axis. In crystals of higher symmetry, where two or more of the axes have equal length, a general form must intersect the equal length axes at different multiples of the unit length. Thus in the tetragonal system the form {121} is a general form.  In the isometric system a general form would have to be something like {123}. Restricted form is an obsolete term and generally not used in Crystallography.

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