Global InformationEvenkite information
| Evenkite | |
|---|---|
 Evenkite from Dubnik, Slovakia | |
| General | |
| Category | Organic mineral |
| Formula (repeating unit) | C24H50 |
| IMA symbol | Evk[1] |
| Strunz classification | 10.BA.50 |
| Crystal system | Orthorhombic |
| Crystal class | Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m) |
| Space group | Pbcm |
| Unit cell | a = 7.47, b = 4.98, c = 65.85 [Å]; Z = 4 |
| Identification | |
| Color | Colorless or pale yellow |
| Crystal habit | Tabular pseudohexagonal crystals, granular, disseminated |
| Twinning | Polysynthetic |
| Cleavage | {001} Perfect |
| Mohs scale hardness | 1 |
| Luster | Waxy |
| Diaphaneity | Transparent |
| Specific gravity | 0.87 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.504 nβ = 1.504 nγ = 1.553 |
| Birefringence | δ = 0.049 |
| References | [2][3][4][5][6][7][8][9][10] |
Evenkite is a rare hydrocarbon mineral with formula C24H50; specifically, H3C–(CH2)22–CH3, the alkane n-tetracosane. [9] It occurs as very soft (Mohs hardness 1) transparent crystals, colorless to yellow, with a waxy luster. The softness is a characteristic of crystalline long-chain alkanes, which are the main constituents of paraffin wax.[10]
Evenkite one of very few minerals that consist of crystalline hydrocarbons,[8][6] which include carpathite (pure crystalline coronene, a polyaromatic hydrocarbon).[11] It is also one of the few non-porous minerals that floats on water. It has been claimed to be the same as hatchettite.[12]
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ Mindat.org
- ^ Webmineral data
- ^ Handbook of Mineralogy
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