Which term refers to a crystal distorted during growth, with two or more intergrown crystals with opposing crystal directions?

Which term refers to a crystal distorted during growth, with two or more intergrown crystals with opposing crystal directions?

• A. Twinned crystal
• B. Twisting
• C. Twinning Wisp (W)
• D. Two-point diamond

Answer: (A)

A crystal that distorts during growth and forms two or more intergrown parts with opposite orientations is described as a twinned crystal. This happens when a twin plane interrupts the growing lattice, creating a second domain that is a mirror (or otherwise related by a specific symmetry) of the first. The result is two crystalline regions that share a boundary and have opposite crystal directions, or orientations, within the same overall crystal. This is the defining feature of twinning in crystals. Twisting implies a continuous, helical deformation rather than discrete intergrown domains. Twinning Wisp isn’t a standard term, and Two-point diamond isn’t a recognized description for this phenomenon.

A crystal that distorts during growth and forms two or more intergrown parts with opposite orientations is described as a twinned crystal. This happens when a twin plane interrupts the growing lattice, creating a second domain that is a mirror (or otherwise related by a specific symmetry) of the first. The result is two crystalline regions that share a boundary and have opposite crystal directions, or orientations, within the same overall crystal. This is the defining feature of twinning in crystals.

Twisting implies a continuous, helical deformation rather than discrete intergrown domains. Twinning Wisp isn’t a standard term, and Two-point diamond isn’t a recognized description for this phenomenon.