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

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

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

Answer: (C)

Crystal twinning is when a crystal changes orientation during growth and a second domain forms in a mirrored relationship about a boundary. This creates two or more intergrown crystals with opposite crystal directions. The term that best describes this arrangement is a twinned crystal, because it directly names the structure composed of mirrored crystal parts joined together by a twin boundary formed during growth. Terms like twinning wisps refer to growth features related to twinning but not the actual crystal form, and three-point or two-point diamond aren’t standard terms for describing this phenomenon.

Crystal twinning is when a crystal changes orientation during growth and a second domain forms in a mirrored relationship about a boundary. This creates two or more intergrown crystals with opposite crystal directions. The term that best describes this arrangement is a twinned crystal, because it directly names the structure composed of mirrored crystal parts joined together by a twin boundary formed during growth. Terms like twinning wisps refer to growth features related to twinning but not the actual crystal form, and three-point or two-point diamond aren’t standard terms for describing this phenomenon.