Chapter 11 DIAMOND
Native carbon. The same element also occurs naturally in the form of graphite, another mineral with completely different characteristics and appearance.
Its name comes from the Greek adámas,
meaning "invincible," in recognition of its exceptional hardness, which makes it resist any form of abrasion by other minerals.Crystal system
Diamonds most commonly occur as isolated crystals, which may be in the form of a more or less perfect octahedron, an octahedron with curved faces, or sometimes an icositetrahedron or hexoctahedron, which...