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This introductory lecture explains four crystal symmetry operations, types of twinning, and Miller indices for crystal planes. It includes worked Miller-index examples and connects them to d-spacing, Bragg’s law, X-ray diffraction, and mineral identification.
Syllabus
4 symmetry operations
mirrors and rotation axes
centers of symmetry or inversion
rotoinversion axes
twinning crystals
cleavage planes & miller indices
unit cells in crystal lattices
miller indices explained
miller indices practice
why do miller indices matter?
upcoming content!
bloopers
Taught by
GEO GIRL