7 Crystal systems 14 Bravais Lattices CUBIC a=b=c =B=y=90° TETRAGONAL a=b+c =B=y=90° ORTHORHOMBIC a+b+c &=B=y=90° HEXAGONAL TRIGONAL a=btc a=b=c =B=90° =B=y*90° y=120° MONOCLINIC atb#c 4 Types of Unit Cell P=Primitive =y=90° I=Body-Centred B*120° F=Face-Centred C=Side Centred TRICLINIC a+b+c 7 Crystal Classes *阝*y*90° →14 Bravais Lattices 44 7 Crystal systems 14 Bravais Lattices