Question

The stereographic projection given below represents a 

• A. trigonal rhombohedron
• B. hexagonal scalenohedron
• C. trigonal dipyramid
• D. hexagonal dipyramid

Hint:

Stereographic projections are useful in understanding the symmetry and crystallography of minerals, especially for understanding their crystal forms.

Answer 1

The Correct Option is C

Step 1: Understanding Stereographic Projections.
Stereographic projections are used to represent the symmetry of crystals. The figure shows a hexagonal dipyramid, which has a specific symmetry with the faces meeting along the hexagonal axis.
Step 2: Analyzing the options.
(A) trigonal rhombohedron: Incorrect — A trigonal rhombohedron has a different symmetry.
(B) hexagonal scalenohedron: Incorrect — This is not the correct symmetry for the given projection.
(C) trigonal dipyramid: Incorrect — This is not the correct representation for the hexagonal system.
(D) hexagonal dipyramid: Correct — This matches the symmetry of the stereographic projection shown.
Step 3: Conclusion.
The correct answer is (D) hexagonal dipyramid, as it matches the stereographic projection.