Diamonds
* Crystal Structure: Diamond has a face-centered cubic (FCC) lattice structure. This means:
* Carbon atoms are arranged in a three-dimensional, repeating pattern.
* Each carbon atom is bonded to four other carbon atoms in a tetrahedral shape (like a pyramid).
* This strong, tetrahedral bonding gives diamond its incredible hardness.
Rubies
* Crystal Structure: Rubies are a variety of corundum, which has a hexagonal close-packed (HCP) structure.
* This structure is less tightly packed than the FCC structure of diamond.
* Aluminum and oxygen atoms form a hexagonal lattice.
* Chromium ions (Cr³⁺) replace some of the aluminum ions, giving ruby its red color.
Key Differences in Structure:
* Bonding: Diamond's strong covalent bonds between carbon atoms make it the hardest naturally occurring mineral. Ruby's ionic bonds are weaker.
* Symmetry: The FCC structure of diamond has higher symmetry than the HCP structure of ruby.
* Packing: Diamond's FCC structure is more densely packed than ruby's HCP structure.
In a nutshell: The difference in the regular arrangement of atoms in diamond and ruby is what gives them their distinct properties. This difference in structure is also why diamond is much harder than ruby.
