Question

Diamond exhibits which type of structures:

• A. Hexagonal and orthorhombic
• B. Orthorhombic and tetragonal
• C. Trigonal and monoclinic
• D. Cubic and hexagonal

Hint:

Remember the common crystal structures of key materials. Carbon is a great example with multiple important allotropes: diamond (cubic), graphite (hexagonal), and Lonsdaleite (hexagonal diamond). Knowing these helps in quickly identifying correct options.

Answer 1

The Correct Option is D

Step 1: Concept Overview:
The question concerns diamond's crystal structures. Diamond, a carbon allotrope, can exist in different crystallographic forms. We aim to identify these forms.
Step 2: Detailed Analysis:
The prevalent, stable diamond form possesses a diamond cubic lattice. This lattice is classified under the cubic crystal system and comprises two interwoven face-centered cubic (FCC) lattices.
Lonsdaleite, a less common carbon allotrope (also known as hexagonal diamond), features a hexagonal crystal structure. Lonsdaleite is found in meteorites and can be created synthetically.
In summary, diamond and related structures manifest as both cubic and hexagonal.
Step 3: Conclusion:
Diamond displays cubic and hexagonal crystalline forms.