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Layer-stacking Polytypes

Layer-based minerals having different symmetry systems by different stacking sequences of layer units.

Ramsdell notation (Suffix, Italic)
Cubic: -C
Tetragonal: -Q, -TT
Orthorhombic: -OR, -O
Hexagonal: -H
Trigonal: -T
Rhombohedral: -R
Monoclinic: -M
Triclinic: -A, -TC
Pseudo: -P

A list of minerals showing layer-stacking polytypism