Laws of crystallography

Laws of crystallography

1. A Lecture on Laws of Crystallography P. S. Ganvir Assistant Professor M. G. Arts, Science and Late Commerce College, Armori , Dist – Gadchiroli .

2. Law of constancy of interfacial angle: This law states that angle between adjacent corresponding faces is inter facial angles of the crystal of a particular substance is always constant inspite of different shapes and sizes and mode of growth of crystal.

3. Law of rational indices: It states that the intercept made by any crystallographic axis to crystal face will always be represented in whole number.  

4. Law of constancy of symmetry : T his law states that all crystals of a substance have the same elements of symmetry is plane of symmetry, axis of symmetry and centre of symmetry . Cube Axis of symmetry – 13 Plane of symmetry – 9 Centre of symmetry – 1 Total - 23

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