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 systems are often characterized by forms such as {1120}, which is a prismatic crystal form seen in minerals like quartz.

Answer 1

The Correct Option is A

Step 1: Understanding the question.
The question asks for the prismatic crystal form that belongs to the hexagonal crystal system. The hexagonal crystal system is characterized by certain specific forms, and the {1120} form is a typical prismatic form of this system.
Step 2: Analyzing the options.
(A) {1120:} Correct — This is a prismatic form that belongs to the hexagonal crystal system. It is commonly found in minerals like quartz and other hexagonal crystals.
(B) {h0hl:} This is a generalized form, and although it can be used for several systems, it is not specific to the hexagonal system.
(C) {0001:} This form is commonly seen in the hexagonal system, but it is not the prismatic form being asked for in this question.
(D) {hk0:} This form is not a prismatic form specific to the hexagonal system.
Step 3: Conclusion.
The correct answer is (A) {1120}, as this form belongs to the hexagonal crystal system.