How Do Diamonds Form? | They Don't Form From Coal!

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Source: geology.com/articles/diamonds-from-coal/


how are diamonds formed


Diamond - Wikipedia, the free encyclopedia

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** Diamond **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
This article is about the mineral. For the gemstone, see Diamond
(gemstone). For other uses, including the shape ◊, see Diamond
(disambiguation).
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This is a featured article. Click here for more information.

Diamond
A clear octahedral stone protrudes from a black rock.
The slightly misshapen octahedral shape of this rough diamond crystal in
matrix is typical of the mineral. Its lustrous faces also indicate that
this crystal is from a primary deposit.
General
Category Native Minerals
Formula
(repeating unit) C
Strunz classification 01.CB.10a
Identification
Formula 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 Isotropic
Refractive index 2.418 (at 500 nm)
Birefringence None
Pleochroism None
Dispersion 0.044
Melting point Pressure dependent
References ^[1]^[2]

In mineralogy, *diamond* (from the ancient Greek αδάμας
– /adámas/ "unbreakable") is a metastable 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


Source: en.wikipedia.org/wiki/Diamond

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