Crystallography Flashcards
a periodic repetition of nodes in a systematic linear displacement
Translation
specific length and direction of systematic displacement by which pattern repeats
Unit of translation vector
Defined by two-unit translation vector
Two dimensional translation
Two dimensional array of pattern nodes generated by two-dimension translation
Plane lattice
a three dimensional array pattern of nodes generated by the two dimensional translation
Space lattice
resulting array of motif of the crystalline substance
Crystal lattice
It is how the substance arranged in a 3d form
Crystal lattice
An imaginary line or axis where a pattern of nodes rotate around
Axis of rotation
A form of symmetry in which the pattern is repeated by reflection through a mirror plane
REFLECTION
an imaginary line or axis where a pattern of nodes rotate around
Mirror plane
repetition of motifs by inverting them through a center called center of inversion
Inversion
Point where the “image” of motif is inverted
Center of inversion
combination of translation with reflection across a mirror plane producing a glide plane
Glide reflection
imaginary plane where nodes glide into
Glide plane
combination of translation with reflection across a mirror plane producing a glide plane
Rotoinversion
combination of translation parallel to an axis with rotation about the axis
Screw rotation
two dimensional motifs that are consistent with the generation of long range, two dimensional arrays
Plane point group
a set of 17 plane lattice groups formed through the combination of the 10 plane points group and five unit meshes
Plane lattice groups
Three-dimensional equivalents of two-dimensional equivalents plane point groups.
Space point groups
A classification of minerals based on the relative measurement of their unit edges (a, b, and c), and the angles between them (a, B, and v).
Crystal system
It takes every point in the shape and moves it to an equal distance on the opposite side
Inversion
Combination of spinning around along the axis and turning inside out
Rotoinversion
As it moves, it flips over the mirror plane
Glide reflection
Twisting something while it pushing forward
Screw rotation
