Karpatite Mineral Data

General Karpatite Information

Chemical Formula:

C24H12

Composition:

Molecular Weight = 300.36 gm

Hydrogen 4.03 % H

Carbon 95.97 % C

______

100.00 %

Empirical Formula:

C₂₄H₁₂

Environment:

Crystallized hydrocarbon composed of coronene (C24H12, 7- member benzene ring.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Transcarpatinian Alps, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Karpatite + Pronunciation

Synonym:

Carpathite

Coronene

Pendletonite

Karpatite Image

Images:

Karpatite

Comments: Pale greenish karpatite with minor red cinnabar.
Location: 4th of July mine, New Idria district, San Benito Co., California, USA. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Karpatite

Comments: Flat lying sprays of fibrous crystals of yellow karpatite to 2.8 cm in length on siliceous jasperoid with drusy quartz. Lower image taken using SW UV light.
Location: Los Picachos, near Picacho Peak, San Benito County, California, USA. Scale: 9.3 x 4.5 x 3.5 cm.
© John Veevaert

Images:

Karpatite

Comments: Prismatic yellow karpatite (Ka) crystal on quartz (Qtz), cinnabar (Cin) and magnesite (Mgs)..
Location: Pichacho Peak Area, San Benito County, California, USA.. Scale: See Image.
© American Mineralogist

Karpatite Crystallography

Axial Ratios:

a:b:c =3.4315:1:2.1426

Cell Dimensions:

a = 16.094, b = 4.69, c = 10.049, Z = 2; beta = 110.79° V = 709.12 Den(Calc)= 1.41

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 7.43(1), 9.5(1), 3.96(0.4),

Crystal Structure:

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Fawcett J K , Trotter J , Proceedings of the Royal Society of London , A289 (1966) p.366-376, The crystal and molecular structure of coronene, Locality: synthetic

Physical Properties of Karpatite

Cleavage:

{001} Perfect

Color:

Yellow, Yellow green, Black.

Density:

1.35

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

1.5 - Between Talc and Gypsum

Luminescence:

Fluorescent, Short UV=vivid electric blue to blue-green, Long UV=vivid electric blue to blue-green.

Luster:

Vitreous - Adamantine

Streak:

yellow white

Optical Properties of Karpatite

Optical Data:

Biaxial (+/-), a=1.76-1.78, b=1.78-1.982, g=2.05-2.15, bire=0.2900-0.3700

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Karpatite

Electron Density:

Bulk Density (Electron Density)=1.46 gm/cc
note: Specific Gravity of Karpatite =1.41 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Karpatite= 0.15 barns/electron
U=PE_Karpatite x rElectron Density= 0.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Karpatite is Not Radioactive

Karpatite Classification

Dana Class:

50.03.07.01 (50)Salts of Organic Acids

(50.03)(Hydrocarbons)

(50.03.07)Dana Group

50.03.07.01 Karpatite C24H12 P 2₁/a 2/m

Strunz Class:

10.BA.30 10 - ORGANIC COMPOUNDS

10.B - Hydrocarbons

10.BA -Hydrocarbons

10.BA.30 Karpatite C24H12 P 2₁/a 2/m

Other Karpatite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin v92:1262) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Karpatite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Karpatite Specimen Label here :

Karpatite

C24H12
Dana No: 50.03.07.01 Strunz No: 10.BA.30
Locality:

Notes: