FoG1 - Mineralogy - Lattices and symmetry Flashcards
1
Q
definition of a lattice
A
set of points that can be described by basic vectors
2
Q
definition of unit cell
A
the basic repeating pattern that a lattice can be broken down into
3
Q
primitive vs non primitive unit cell
A
primitive only has lattice points at the vertices of the unit cell
4
Q
between which axes does angle alpha lie
A
between axes c and b (whatever sides are not the same letter as the angle)
5
Q
how many bravis lattices are there in 3D
A
14
6
Q
meaning of: p, f, i, c
A
p = primative
f = face centred
i = body centred
c = one face centred
7
Q
describe isometric lattice (3D)
A
(cube)
a=b=c
alpha = beta = gamma = 90
8
Q
describe tetragonal lattice (3D)
A
(cuboid)
a=b≠c
alpha = beta = gamma = 90
