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 | |
|---|---|
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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