Question

Which one of the following prismatic crystal forms belongs to the hexagonal crystal system?

• A. {1120}
• B. {h0hl}
• C. {0001}
• D. {hk0}

Hint:

In crystallography, hexagonal forms often have a {0001} prismatic appearance, which is characteristic of minerals like quartz and graphite.

Answer 1

The Correct Option is C

Step 1: Understanding the question.
The question asks for the prismatic crystal form that belongs to the hexagonal crystal system. Hexagonal crystals are defined by specific symmetry and axis arrangements, and the {0001} form is typical of this system.
Step 2: Analyzing the options.
(A) {1120:} This form belongs to the tetragonal system, not the hexagonal one.
(B) {h0hl:} This is a generalized form and not specific to the hexagonal system.
(C) {0001:} Correct — This is the characteristic prismatic form of the hexagonal crystal system, often seen in minerals like quartz.
(D) {hk0:} This form does not specifically correspond to the hexagonal system's prismatic crystals.
Step 3: Conclusion.
The correct answer is (C) {0001}, which is the prismatic crystal form belonging to the hexagonal crystal system.