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Questions and Answers
Match the crystal systems with their axial distances or edge lengths:
Match the crystal systems with their axial distances or edge lengths:
Cubic = a = b = c Tetragonal = a = b ≠c Orthorhombic = a ≠b ≠c Hexagonal = a = b ≠c
Match the crystal systems with their axial angles:
Match the crystal systems with their axial angles:
Cubic = α = β = γ = 90° Tetragonal = α = β = γ = 90° Hexagonal = α = β = 90°, γ = 120° Rhombohedral or Trigonal = α = β = γ ≠90°
Match the examples with their corresponding crystal systems:
Match the examples with their corresponding crystal systems:
Cubic = NaCl, Zinc blende, Cu Orthorhombic = Rhombic sulphur, KNO3, BaSO4 Hexagonal = Graphite, ZnO, CdS Rhombohedral or Trigonal = Calcite (CaCO3), HgS (cinnabar)
Match the possible variations of the crystal systems:
Match the possible variations of the crystal systems:
Match the crystal systems with their characteristics:
Match the crystal systems with their characteristics:
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Study Notes
Crystal Systems Overview
- Crystal systems classify minerals and materials based on their symmetry and geometrical arrangement.
- Each system is characterized by specific axial distances and angles.
Cubic System
- Variations: Primitive, Body-centred, Face-centred.
- Edge lengths: All edges are equal (a = b = c).
- Angles: All angles are right angles (α = β = γ = 90°).
- Common examples: Sodium chloride (NaCl), Zinc blende, Copper (Cu).
Tetragonal System
- Variations: Primitive, Body-centred.
- Edge lengths: Two edges are equal and one is different (a = b ≠c).
- Angles: All angles are right angles (α = β = γ = 90°).
- Common examples: White tin, Tin(IV) oxide (SnO2), Titanium dioxide (TiO2), Calcium sulfate (CaSO4).
Orthorhombic System
- Variations: Primitive, Body-centred, Face-centred, End-centred.
- Edge lengths: All edges are different (a ≠b ≠c).
- Angles: All angles are right angles (α = β = γ = 90°).
- Common examples: Rhombic sulphur, Potassium nitrate (KNO3), Barium sulfate (BaSO4).
Hexagonal System
- Variations: Primitive only.
- Edge lengths: Two edges are equal and one is different (a = b ≠c).
- Angles: Two angles are right angles and one angle is 120° (α = β = 90°, γ = 120°).
- Common examples: Graphite, Zinc oxide (ZnO), Cadmium sulfide (CdS).
Rhombohedral or Trigonal System
- Variations: Primitive only.
- Edge lengths: All edges are equal (a = b = c).
- Angles: All angles are equal but not right angles (α = β = γ ≠90°).
- Common examples: Calcite (CaCO3), Cinnabar (HgS).
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