Which term describes crystal distortion that occurs during growth when one part of the lattice is offset from the rest?

Which term describes crystal distortion that occurs during growth when one part of the lattice is offset from the rest?

• A. Girdle thickness percentage
• B. Gletz
• C. Gravity sorting
• D. Glide plane

Answer: (D)

Glide plane is the term that describes a symmetry operation where a reflection across a plane is followed by a translation parallel to that plane, effectively offsetting part of the lattice as you move along the plane. In crystal growth, such a translation after reflection can manifest as a systematic offset between layers, which is a way to describe distortion arising from this combined movement. The other options don’t fit this idea. Girdle thickness percentage is just a measurement related to the diamond’s outer edge and cut proportions, not lattice distortions. Gravity sorting is a separation technique, not a crystallographic concept. The term listed, while not standard, isn’t the proper crystallographic description either. Glide plane uniquely captures the notion of a lattice arrangement that is offset by a parallel translation after reflection, reflecting the described distortion during growth.

Glide plane is the term that describes a symmetry operation where a reflection across a plane is followed by a translation parallel to that plane, effectively offsetting part of the lattice as you move along the plane. In crystal growth, such a translation after reflection can manifest as a systematic offset between layers, which is a way to describe distortion arising from this combined movement.

The other options don’t fit this idea. Girdle thickness percentage is just a measurement related to the diamond’s outer edge and cut proportions, not lattice distortions. Gravity sorting is a separation technique, not a crystallographic concept. The term listed, while not standard, isn’t the proper crystallographic description either. Glide plane uniquely captures the notion of a lattice arrangement that is offset by a parallel translation after reflection, reflecting the described distortion during growth.