Evenkite

Evenkite
Evenkite
	Evenkite from Dubnik, Slovakia
General
Category	Organic mineral
Formula; (repeating unit)	C24H50
IMA symbol	Evk
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

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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[1] 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-2] Mindat.org

[Webmin-3] Webmineral data

[HBM-4] Handbook of Mineralogy

[span1998-5] Cite error: The named reference span1998 was invoked but never defined (see the help page).

[jech2007-6] Cite error: The named reference jech2007 was invoked but never defined (see the help page).

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[echi2007-11] Cite error: The named reference echi2007 was invoked but never defined (see the help page).

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