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Which type of crystal contains more than one Bravais lattice?
A.Hexagonal
B.Triclinic
C.Rhombohedral
D.Monoclinic

Answer
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Hint: Bravais lattices refers to the configurations into which atoms can be arranged in crystals. There are 14 Bravais lattices in three dimensional systems.

Complete step by step answer:
Lattice system is a group of lattices containing the same set of lattice point groups. There are 14 Bravais lattices in total. These 14 Bravais lattices are divided into 7crystal systems.
The 7crystal systems along with their Bravais lattices are listed in the table.
Sl No.Crystal systemNumber of Bravais latticesTypes of Bravais lattices
1Cubic3primitive, body centered, face centered
2Tetragonal2primitive, body centered
3Hexagonal1primitive
4Rhombohedral1primitive
5Orthorhombic4primitive, body centered, face centered, end centered
6Monoclinic2primitive, end centered
7Triclinic1primitive


The given options contain hexagonal, triclinic, rhombohedral and monoclinic. From the above table, it is clear that, hexagonal, triclinic and rhombohedral crystal systems contain only one Bravais lattice. That one Bravais lattice corresponds to a primitive cell. But the monoclinic crystal system contains two Bravais lattices. These two Bravais lattices are primitive and end centered unit cells. Hence the crystal system which contains more than one Bravais lattice is monoclinic.
Hence the correct option is D.

Note:
Monoclinic system contains primitive and end centered unit cells. The primitive unit cell contains particles only at the eight corners. But the end centered unit cell contains particles in all corners as well as in two opposite faces. Total number of particles in the primitive unit cell is 1 and that in the end centered unit cell is 2.
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