Diamond
Chemical Formula	C
Species	Native Elements
Crystal System	Isometric
Mohs Scale	10
Specific Gravity	3.52
Color	Typically yellow, brown or gray to colorless. Less often blue, green, black, translucent white, pink, Purple, orange, purple and red.
Streak	Colorless
Luster	Adamantine, Greasy
Refractive Index	n = 2.435
Diaphaneity	Transparent, Translucent, Opaque
Cleavage	PerfectPerfect octahedral
Fracture	Irregular/Uneven
Crystal Habit：Octahedral
Geological Setting：Deep volcanic intrusives such as kimberlites. With decreasing pressure the diamonds dissolve back into the rock. To occur at the surface they must arrive from depth quickly and all xls show dissolution features. Being so hard they survive in alluvia.