Which term is used to describe the geometric factor of a well-formed crystal’s external form?

Which term is used to describe the geometric factor of a well-formed crystal’s external form?

• A. Crystal Planes
• B. Glassie
• C. Glide Plane
• D. Crystal Shape (form)

Answer: (D)

The external geometry of a well-formed crystal is described by its crystal form, or crystal shape. This term captures the overall outline and the arrangement of visible faces that define the crystal’s external appearance. Crystal planes refer to internal lattice planes that help explain internal structure, not the external outline. A glide plane is a symmetry operation, and “Glassie” isn’t a standard term in this context. So the external geometric factor is best described as crystal shape (form).

The external geometry of a well-formed crystal is described by its crystal form, or crystal shape. This term captures the overall outline and the arrangement of visible faces that define the crystal’s external appearance. Crystal planes refer to internal lattice planes that help explain internal structure, not the external outline. A glide plane is a symmetry operation, and “Glassie” isn’t a standard term in this context. So the external geometric factor is best described as crystal shape (form).