Diamonds belong to which crystal system?

Diamonds belong to which crystal system?

• A. Isometric crystal system
• B. Hexagonal
• C. Tetragonal
• D. Isometric or Cubic crystal system

Answer: (D)

Crystals are grouped by symmetry and how their lattice parameters line up. Diamonds have a lattice where all three axes are equal and all angles are 90 degrees, giving high symmetry in three perpendicular directions. That places them in the cubic, also called isometric, crystal system. In mineral terminology, isometric and cubic refer to the same system, so saying “isometric or cubic” covers the correct classification. Hexagonal and tetragonal systems have different axis relationships (a ≠ b or a ≠ c, or angles that aren’t all 90 degrees), which don’t match diamond’s symmetry. So the best answer recognizes both names for the same system.

Crystals are grouped by symmetry and how their lattice parameters line up. Diamonds have a lattice where all three axes are equal and all angles are 90 degrees, giving high symmetry in three perpendicular directions. That places them in the cubic, also called isometric, crystal system. In mineral terminology, isometric and cubic refer to the same system, so saying “isometric or cubic” covers the correct classification. Hexagonal and tetragonal systems have different axis relationships (a ≠ b or a ≠ c, or angles that aren’t all 90 degrees), which don’t match diamond’s symmetry. So the best answer recognizes both names for the same system.