|General and classification|
|chemical formula||C 24 H 12|
(and possibly department)
|Organic compounds - hydrocarbons|
System no. to Strunz
and to Dana
|10.BA.30 ( 8th edition : IX / B.02)
|Crystal class ; symbol||monoclinic prismatic 2 / m|
|Space group||P 2 1 / c or P 2 / c|
a = 10.035 Å ; b = 4.695 Å; c = 16.014 Å
β = 69 °
|Formula units||Z = 2|
|Density (g / cm 3 )||1.35 to 1.4|
|Cleavage||completely after |
|Break ; Tenacity||brittle|
|colour||yellow to yellow-green|
|Line color||light yellow|
|shine||Diamond luster, glass luster|
n α = 1.760 to 1.780
n β = 1.780 to 1.982
n γ = 2.050 to 2.150
|Birefringence||δ = 0.290 to 0.370|
|Optical character||alternating biaxially|
Carpathite (formerly Pendletonit , renamed in 1971) is a rarely occurring hydrocarbon - mineral from the mineral class of organic compounds . It crystallizes in the monoclinic crystal system with the chemical composition C 24 H 12 and forms yellow to yellow-green, transparent crystals with a luster similar to glass or diamond. Chemically, it is the polycyclic aromatic hydrocarbon coronene .
Etymology and history
In the Strunz system, carpathite is one of the organic compounds. In the outdated eighth edition , it forms a subgroup of nitrogen-free hydrocarbons with Dinit , Fichtelit , Flagstaffit , Kratochvílit , Hartit , Hoelit , Idrialin , Ravatit , Refikit and Simonellite . In the new ninth edition , it forms a separate subgroup of subdivision 10.BA of hydrocarbons.
In the Dana system , carpathite forms its own subgroup of the "salts of organic acids and hydrocarbons".
Carpathite crystallizes in the monoclinic prismatic crystal system in the space group P 2 1 / c or P 2 / c with the lattice parameters a = 10.035 Å ; b = 4.695 Å and c = 16.014 Å; β = 69 ° and two formula units per unit cell .
When exposed to long-wave UV light , carpathite is stimulated to produce a strong, straw-yellow fluorescence . The Mohs hardness is like that of talc only one, which means that the mineral can be scratched with a fingernail already. With a density of 1.35 to 1.4 g / cm³ it is only slightly heavier than water (1 g / cm³).
Education and Locations
- Webmineral - Karpatite (Engl.)
- Karpatite at mindat.org (engl.)
- Entry on pendletonite. In: Römpp Online . Georg Thieme Verlag, accessed on June 7, 2014.
- Dana Salts of Organic Acids Classification at webmineral.com. .