Tugarinovite
| Tugarinovite | |
|---|---|
| General and classification | |
| other names |
IMA 1979-072 |
| chemical formula | MoO 2 |
|
Mineral class (and possibly department) |
Oxides and hydroxides |
|
System no. to Strunz and to Dana |
4.DB.05 ( 8th edition : IV / D.28) 04.04.15.01 |
| Crystallographic Data | |
| Crystal system | monoclinic |
| Crystal class ; symbol | monoclinic prismatic; 2 / m |
| Space group | P 2 1 / c (No. 14) |
| Lattice parameters |
a = 5.58 Å ; b = 4.82 Å; c = 5.51 Å β = 119 ° 32 ' |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | 4.6 |
| Density (g / cm 3 ) | 6.58 |
| Cleavage | Please complete |
| colour | dark purple-brown |
| Line color | greenish gray |
| transparency | semi-transparent |
| shine | greasy to metallic |
Tugarinovite , chemically molybdenum (IV) oxide , is a very rare mineral from the mineral class of oxides and hydroxides . It crystallizes in the monoclinic crystal system with the chemical composition MoO 2 and forms up to 1.5 mm large, prismatic or thick tabular crystals of purple-brown color.
Special properties
Tugarinovite is insoluble in hydrochloric and sulfuric acid , but easily dissolves in dilute nitric acid .
Etymology and history
The mineral was first in 1980 by WG Kruglova, A. A Potcryaikina, GA Sidorenko, LS Dubakina and JG Rjabewa in the molybdenum-uranium deposit Lenskoje in the Amur Oblast in the Far East of Russia discovered. It was named after the Russian geochemist Alexei Ivanovich Tugarinow .
classification
In the Strunz system , tugarinovite is counted among the oxides with a ratio of metal to oxygen of 1: 2. After the 8th edition it forms its own subgroup, in the 9th edition the rutile group with pyrolusite , cassiterite , paratellurite , plattnerite , rutile , tripuhyite , argutite and varlamoffite .
In the Dana system , it forms its own subgroup of the simple oxides with a cation charge of 4+.
Education and Locations
Tugarinovite is formed by metasomatosis under reducing conditions when only a little sulfur is present. It is associated with uraninite , molybdenite , galena , zircon and wulfenite .
In addition to the type locality, only three other sites are known, the Kudriavy volcano on the Kuril island of Iturup , the Allende meteorite , which was found near Pueblito de Allende in Mexico and in a coal mine near Radvanice v Čechách near Trutnov in the Czech Republic .
Crystal structure
Tugarinovite crystallizes in the monoclinic crystal system in the space group P 2 1 / c (space group no. 14) with the lattice parameters a = 5.58 Å ; b = 4.82 Å, c = 5.51 Å and β = 119 ° 32 'as well as four formula units per unit cell .
See also
literature
- Tugarinovite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 68 kB ; accessed on January 6, 2017]).
Web links
Individual evidence
- ↑ a b c VG Kruglova, A. A Potcryaikina, GA Sidorenko, LS Dubakina, EG Ryabeva: Tugarinovite, (MoO 2 ), a new hypogene molybdenum mineral. In: Zapiski Vses. Mineralogist Obsh. 1980, 109, pp. 465-468; Abstract in: Michael Fleischer, Adolf Pabst: New Mineral Names. In: American Mineralogist. 1981, 66, pp. 438-439 ( pdf )
- ↑ List of locations for tugarinovite in the Mineralienatlas and Mindat