Titre du document / Document title
Ravatite, C
14H
10, a new organic mineral species from Ravat, Tadzhikistan
Auteur(s) / Author(s)
NASDALA L.
(1) ;
PEKOV I. V. ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Freiberg mining acad., inst. theoretical physics, 9200 Freiburg, ALLEMAGNE
Résumé / Abstract
The new organic mineral ravatite (analyzed as C
14.1H
9.9, idealized formula C
14H
10), identical with synthetic phenanthrene, is described as a sublimation product caused by the natural combustion of a brown coal seam near Ravat/Tadzhikistan (southwestern Tjan' Shan'). It forms thin, platelet-like individuals with diameters of mainly a few hundred micrometers which are usually aggregated to thin crusts on a bituminous, H
2SO
4-impregnated coaly-earthy material. Ravatite is colourless, or―dependent on the amount of coaly, gas and other inclusions―white to pale grey and transparent to translucent. It shows a vitreous to wax-like lustre. Ravatite has a monoclinic lattice (space group P2
1) with a
o = 8.392(5)Å; b
o = 6.181(3)Å; co = 9.558(5)Å; β = 98.48(12)°; V = 490.4(4)Å
3; Z = 2. The observed strongest five X-ray powder diffraction lines [d in Å (I
rel) (hkl)] are: 9.434(100)(001); 4.028(13)(201); 4.941(11)(110); 4.724(11)(002); 3.371(10)(211). The Mohs hardness is about 1; the calculated and the measured densities are 1,207(1) and 1.11(2) g/cm
3, respectively. Ravatite shows a whitish-yellow fluorescence under ultraviolet light. The initial temperature of melting is 94.3 °C. Infrared absorption and Raman data do not differ significantly from data of synthetic phenanthrene
Revue / Journal Title
European journal of mineralogy
ISSN 0935-1221
Source / Source
1993, vol. 5, n
o4, pp. 699-705 (17 ref.)
Langue / Language
Anglais
Editeur / Publisher
Schweizerbart, Stuttgart, ALLEMAGNE
(1989)
(Revue)
Mots-clés anglais / English Keywords
organic compounds ;
new minerals ;
Tadzhikistan ;
structural formula ;
aromatic hydrocarbons ;
sublimation ;
combustion ;
coal ;
habit ;
grain size ;
bitumens ;
color ;
crystal structure ;
symmetry ;
space groups ;
unit cell ;
cell dimensions ;
X-ray diffraction analysis ;
X-ray powder diffraction ;
hardness ;
density ;
fluorescence ;
ultraviolet rays ;
infrared spectroscopy ;
Raman spectroscopy ;
SEM data ;
chemical composition ;
thermal analysis ;
organic residues ;
sedimentary rocks ;
Mots-clés français / French Keywords
Minéral organique ;
Minéral nouveau ;
Tadjikistan ;
Formule structurale ;
Hydrocarbure aromatique ;
Sublimation ;
Combustion ;
Charbon ;
Habitus ;
Dimension grain ;
Bitume ;
Couleur ;
Structure cristalline ;
Symétrie ;
Groupe espace ;
Maille élémentaire ;
Constante réticulaire ;
Diffraction RX ;
Diagramme poudre ;
Dureté ;
Densité ;
Fluorescence ;
Rayon UV ;
Spectrométrie IR ;
Spectrométrie Raman ;
Ravatite ;
CEI ;
Tjan Shan ;
Température fusion ;
Phenanthrene ;
Donnée MEB ;
Analyse chimique ;
Analyse thermique ;
Roche carbonée ;
Roche sédimentaire ;
Mots-clés espagnols / Spanish Keywords
Mineral orgánico ;
Mineral nuevo ;
Tadjikistán ;
Hidrocarburo aromático ;
Sublimación ;
Combustión ;
Carbón ;
Hábito ;
Dimensión grano ;
Asfalto ;
Color ;
Estructura cristalina ;
Simetría ;
Grupo espacio ;
Celdilla cristalina ;
Constante reticular ;
Difracción RX ;
Diagrama polvo ;
Dureza ;
Densidad ;
Fluorescencia ;
Rayos UV ;
Espectrometría IR ;
Espectrometría Raman ;
Dato MEB ;
Análisis químico ;
Análisis térmico ;
Roca carbonosa ;
Roca sedimentaria ;
Localisation / Location
INIST-CNRS, Cote INIST : 519, 35400003482560.0100
Nº notice refdoc (ud4) : 4930377
