Question:
The surface along which the lattice points are shared in twinned crystals is called as
The surface along which the lattice points are shared in twinned crystals is called as
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A twin is an intergrowth of two or more crystals of the same substance related by a definite symmetry operation.
Updated On: Jun 16, 2026
- Composition surface
- Triaxial surface
- Twisted surface
- Jointed surface
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The Correct Option is A
Solution and Explanation
Concept:
A twin is an intergrowth of two or more crystals of the same substance related by a definite symmetry operation. The plane or surface along which the two individuals are joined and share common lattice points is a specific feature of twinning.
Step 1:
In twinning, the two parts meet along a surface. The lattice points that are shared by both individuals lie on this surface.
Step 2:
This shared boundary is known as the composition surface (or composition plane when it is planar). The twin axis and twin plane describe the symmetry relation, but the surface of contact sharing lattice points is the composition surface.
Answer: Option (1) — Composition surface.
A twin is an intergrowth of two or more crystals of the same substance related by a definite symmetry operation. The plane or surface along which the two individuals are joined and share common lattice points is a specific feature of twinning.
Step 1:
In twinning, the two parts meet along a surface. The lattice points that are shared by both individuals lie on this surface.
Step 2:
This shared boundary is known as the composition surface (or composition plane when it is planar). The twin axis and twin plane describe the symmetry relation, but the surface of contact sharing lattice points is the composition surface.
Answer: Option (1) — Composition surface.
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