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Diamond
A scattering of round-brilliant cut diamonds shows off the many reflecting facets.
General
Category	Native Minerals
Chemical formula	C
Identification
Molar mass	12.01  g·mol -1
Color	Typically yellow, brown or gray to colorless. Less often blue, green, black, translucent white, pink, violet, orange, purple and red.
Crystal habit	Octahedral
Crystal system	Isometric-Hexoctahedral ( Cubic )
Cleavage	111 (perfect in four directions)
Fracture	Conchoidal (shell-like)
Mohs scale hardness	10
Luster	Adamantine
Streak	colorless
Diaphaneity	Transparent to subtransparent to translucent
Specific gravity	3.52 ± 0.01
Density	3.5? 3.53  g/cm 3
Polish luster	Adamantine
Optical properties	Singly Refractive
Refractive index	2.418 (at 500 nm)
Birefringence	None
Pleochroism	None
Dispersion	0.044
References	[1] [2]

In mineralogy , diam??ndi (from the ancient Greek αδ?μα? ? adamas "unbreakable") is an allotrope of carbon , where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a diamond lattice . Diamond is less stable than graphite , but the conversion rate from diamond to graphite is negligible at ambient conditions . Diamond is renowned as a material with superlative physical qualities, most of which originate from the strong covalent bonding between its atoms. In particular, diamond has the highest hardness and thermal conductivity of any bulk material. Those properties determine the major industrial application of diamond in cutting and polishing tools and the scientific applications in diamond knives and diamond anvil cells .

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