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Questions and Answers
Match the crystal system with its possible variations:
Match the crystal system with its possible variations:
Cubic = Primitive, Body-centred, Face-centred Tetragonal = Primitive, Body-centred Orthorhombic = Primitive, Face-centred Hexagonal = Primitive
Match the crystal system with its axial distances or edge lengths:
Match the crystal system with its axial distances or edge lengths:
Cubic = a = b = c Tetragonal = a = b ≠c Orthorhombic = a ≠b ≠c Hexagonal = a = b = c
Match the crystal system with its axial angles:
Match the crystal system with its axial angles:
Cubic = α = β = γ = 90° Tetragonal = α = β = γ = 90° Hexagonal = α = β = 90°, γ = 120° Rhombohedral = α = β = γ ≠90°
Match the crystal system with an example:
Match the crystal system with an example:
Match the crystal system with its characteristic feature:
Match the crystal system with its characteristic feature:
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Study Notes
Crystal Systems Overview
- Crystal systems are classified into unique types based on their geometric attributes and symmetry.
- Axial distances (edge lengths) and angles between axes critically define each crystal system.
Cubic System
- Variations include Primitive, Body-centred, and Face-centred types.
- All edges are equal: a = b = c, and angles are right angles: α = β = γ = 90°.
- Common examples: Sodium chloride (NaCl), Zinc blende, and Copper (Cu).
Tetragonal System
- Variations are Primitive and Body-centred.
- Edges are equal in two dimensions with a different third dimension: a = b = c, and angles remain right: α = β = γ = 90°.
- Notable examples: White tin, Tin dioxide (SnO2), Titanium dioxide (TiO2), and Calcium sulfate (CaSO4).
Orthorhombic System
- Features Primitive, Body-centred, Face-centred, and End-centred variations.
- Edges differ: a ≠b ≠c, while angles still hold at right angles: α = β = γ = 90°.
- Examples include Rhombic sulfur, Potassium nitrate (KNO3), and Barium sulfate (BaSO4).
Hexagonal System
- Only shows a Primitive variation.
- Two edges are equal while the third is different: a = b ≠c, with angles α = β = 90° and γ = 120°.
- Common materials: Graphite, Zinc oxide (ZnO), and Cadmium sulfide (CdS).
Rhombohedral (Trigonal) System
- Consists of Primitive variations only.
- All edges are equal: a = b = c, but angles are not right: α = β = γ ≠90°.
- Key examples include Calcite (CaCO3) and Mercury sulfide (HgS, cinnabar).
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