A crystal form of carbon occurs as hard, colorless, or colored isomeric crystals. It is used as a valuable stone, for cut glass, and as a bearing for sensitive mechanisms, and the further discussion can be defined as follows:
- It is a mineral comprised of elemental carbon that would be the hardest naturally occurring material and the most prized gemstone.
- It has such a variety of essential industrial uses due to its exceptional toughness.
- Carbon atoms are arranged in the following lattice, that has no free electrons.
- It has a massive covalent architecture whereby each carbon atom is linked to four other carbon atoms by covalent bonds.
Therefore the answer is "Third choice".
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