Podcast
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:
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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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Description
This quiz explores various crystal systems, highlighting their variations, axial distances, and angles. It includes examples for each system, such as cubic, tetragonal, and orthorhombic. Test your knowledge on the unique properties and classifications of these crystalline structures.
