1 4.1 Crystalline substances 2 4.2 Symmetry operations 3 4.3 Two‐dimensional motifs and lattices (meshes) 4 4.4 Three‐dimensional motifs and lattices 5 4.5 Crystal systems 6 4.6 Indexing planes in crystals 7 4.7 Twinned crystals 8 4.8 Crystal defects 9 4.9 Polymorphs and pseudomorphs
1 4.1 Crystalline substances
2 4.2 Symmetry operations
3 4.3 Two‐dimensional motifs and lattices (meshes)
4 4.4 Three‐dimensional motifs and lattices
5 4.5 Crystal systems
6 4.6 Indexing planes in crystals
7 4.7 Twinned crystals
8 4.8 Crystal defects
9 4.9 Polymorphs and pseudomorphs
