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Diamond ‒ a form of carbon **Symbol:** C **Atomic number:** 6 **International name:** Diamond **Mohs scale hardness:** 10 **Crystal system:** Cubic system **Unit cell:** Face-centered cubic **Crystal habit:** Predominantly forms as octahedrons **Description:** Diamond is the hardest naturally occurring mineral and one of the hardest known substances overall. Despite its hardness, diamond is relatively brittle. It has the highest known thermal conductivity of any material. **Applications:** Diamonds are the most precious gemstones and widely used in jewelry in their polished form. Because of their exceptional hardness and thermal properties, they are used in industry for cutting, grinding and machining hard materials.
