Graphite
From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia
Graphite is a crystalline allotrope o carbon, a semimetal an a native element mineral. Graphite is the maist stable form o carbon unner staundart conditions. Tharefore, it is uised in thermochemistry as the staundart state for definin the heat o formation o carbon compoonds.
Graphite | |
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![]() Graphite specimen | |
General | |
Category | Native mineral |
Formula (repeatin unit) | C |
Strunz clessification | 1.CB.05a |
Creestal seestem | Hexagonal |
Creestal cless | Dihexagonal dipyramidal (6mmm) H-M symbol: (6/m 2/m 2/m) |
Space group | P63/mmc |
Unit cell | a = 2.461, c = 6.708 [Å]; Z = 4 |
Identification | |
Colour | Iron-black to steel-gray; deep blue in transmitted light |
Creestal habit | Tabular, six-sided foliated masses, granular to compacted masses |
Twinnin | Present |
Cleavage | Basal – perfect on {0001} |
Fractur | Flaky, ithergates rouch when nae on cleavage |
Tenacity | Flexible non-elastic, sectile |
Mohs scale haurdness | 1–2 |
Skinkle | Metallic, yirdy |
Streak | Black |
Diaphaneity | Opaque, transparent anerly in extremely thin flakes |
Density | 2.09–2.23 g/cm3 |
Optical properties | Uniaxial (–) |
Pleochroism | Strang |
Solubility | Soluble in molten nickel, warm chlorosulfuric acid[1] |
Ither chairacteristics | strangly anisotropic, conducts electricity, creashie feel, readily merks |
References | [2][3][4] |
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