Diamond - C

Habit: Comes in a range of colors from colorless or yellow, brown to black, and rarely pink, green, blue, orange or red. Crystals are octahedral, dodecahedral, cubic and even more complex crystals; massive, fine-grained (carbonado) rare. Adamantine to greasy Luster; transparent to translucent

Environment: Product of deep-seated crystallization of ultrabasic igneous magmas, in kimberlite pipes or lamproites. Diamond crystals are also found in alluvial deposits, from the erosion of such kimberlite pipes.

Etymology: Most likely derived from the Greek adamas, "invincible", for its extreme hardness.