Which term means composed of crystals or related to crystals?

• A. Crystal Systems
• B. Glassie
• C. Defect
• D. Crystalline

Answer: (D)

Crystalline is the term that means composed of crystals or related to crystals. A crystalline material has an ordered, repeating arrangement of atoms, giving it a well-defined crystal lattice and often visible crystal faces. This orderly structure is the hallmark of crystals and explains why minerals and gems show specific shapes and cleavage.

Crystal systems refer to how crystal lattices are categorized geometrically, not to the material being described as consisting of crystals. Glassy or glass-like indicates an amorphous, non-crystalline structure. A defect is a flaw within a crystal lattice, not a descriptor of the material’s overall crystalline nature. So the word that directly conveys “composed of crystals or related to crystals” is crystalline.