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Diamond structure ‒ Modification of carbon
**Formula:** C
**Atomic number:** 6
**International title:** carboneum
**Mohs scale hardness:** 10
**Crystal system:** Cubic system
**Cell:** Face centred cubic
**Crystal habit:** The predominant form of octahedrons
**Information:** Diamond is the hardest natural mineral known and one of the hardest substances at all, but it is quite fragile. Diamond has the highest known thermal conductivity.
**Use:** Diamond is the most precious gemstone and in the form of a polished diamond, it is used in jewellery. It is also used in the industry (for machining hard materials).
