Carpathite

Carpathite
Carpathite
	Carpathite from New Idria District, California USA
General
Category	Organic mineral
Formula; (repeating unit)	C24H12
IMA symbol	Cpa
Strunz classification	10.BA.30
Crystal system	Monoclinic
Crystal class	Prismatic (2/m) ; (same H-M symbol)
Space group	P21/c, P21/n
Unit cell	a = 1625 pm, b = 463.8 pm, c = 1042 pm; β = 111°10'; Z = 2
Identification
Color	Yellow, yellowish brown on exposure
Crystal habit	Acicular to thin tabular in bladed groups and fibrous radiating aggregates
Cleavage	Perfect on [001], [100] and [201]
Fracture	Splintery
Tenacity	Flexible, nearly plastic
Mohs scale hardness	1.5
Luster	Vitreous - adamantine
Streak	Yellow white
Diaphaneity	Transparent
Specific gravity	1.35
Optical properties	Biaxial (+/-)
Refractive index	nα = 1.760 - 1.780 nβ = 1.977 - 1.982 nγ = 2.050 - 2.150
Birefringence	δ = 0.290 - 0.370
Melting point	432.8 °C
Other characteristics	Fluorescent - electric blue to blue-green
References

Carpathite is a very rare hydrocarbon mineral, consisting of exceptionally pure coronene (C₂₄H₁₂), a polycyclic aromatic hydrocarbon.^[8]^[9] The name has been spelled karpatite^[3] and the mineral was improperly renamed pendletonite.^[2]

^ 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.
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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.

[murd1967-2] Cite error: The named reference murd1967 was invoked but never defined (see the help page).

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