Which one of the following has no cleavage plane?
Correct answer: A. Graphite
- A. Graphite
- B. Nacl crystals
- C. Copper crystals
- D. Ice
Explanation
Graphite has a unique structure made up of layers of carbon atoms arranged in a hexagonal pattern. These layers are held together by weak forces called van der Waals forces. Because of these weak forces, graphite can easily slide and break apart into thin sheets. This is why it's commonly used in pencils, as the layers can easily leave marks on paper. Unlike minerals with cleavage planes, graphite doesn't have a specific direction along which it naturally splits.
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About Crystalline Solids
Crystalline solids contain particles arranged in a regular repeating lattice described by a unit cell. Their study includes coordination number, packing efficiency, density, anisotropy, cleavage, polymorphism and common crystal systems, along with ionic, molecular, covalent network and metallic crystals. Crystalline order differs from the random arrangement of amorphous solids.
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