Which term means the geometric shape of a well-formed crystal?

Which term means the geometric shape of a well-formed crystal?

• A. Crystalline
• B. Crystal planes
• C. Crystal shape (form)
• D. Crystal structure (lattice)

Answer: (C)

Crystal form defines the external geometric shape of a well-formed crystal. It describes the arrangement and appearance of the crystal faces that give the crystal its overall outline, the visible geometry you’d observe in a well-formed sample. This is distinct from being crystalline, which refers to the material having a regular internal arrangement of atoms; crystal planes, which are specific flat faces or families of planes within the lattice; and crystal structure (lattice), which is the internal arrangement of atoms. The term crystal shape (form) is the exact way to describe that external geometry—whether you see a cube, prism, dodecahedron, or another inherited form.

Crystal form defines the external geometric shape of a well-formed crystal. It describes the arrangement and appearance of the crystal faces that give the crystal its overall outline, the visible geometry you’d observe in a well-formed sample. This is distinct from being crystalline, which refers to the material having a regular internal arrangement of atoms; crystal planes, which are specific flat faces or families of planes within the lattice; and crystal structure (lattice), which is the internal arrangement of atoms. The term crystal shape (form) is the exact way to describe that external geometry—whether you see a cube, prism, dodecahedron, or another inherited form.