Vulcanite
| Vulcanite | |
|---|---|
| General and classification | |
| chemical formula | CuTe |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.75 ( 8th edition : II / C.24) 08/02/13/01 |
| Crystallographic Data | |
| Crystal system | orthorhombic |
| Crystal class ; symbol | orthorhombic-dipyramidal; 2 / m 2 / m 2 / m |
| Room group (no.) | Pmnm (No. 59) |
| Lattice parameters | a = 4.09 Å ; b = 6.95 Å; c = 3.15 Å Please complete the source as an individual reference |
| Formula units | Z = 2 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 1 to 2 |
| Density (g / cm 3 ) | 7.1 |
| Cleavage | Well |
| colour | bronze-yellow-metallic |
| Line color | Please complete |
| transparency | opaque |
| shine | metallic |
Vulcanite , chemically copper (II) telluride , is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the orthorhombic crystal system with the chemical composition CuTe and forms 0.1 to 1.1 mm large, prismatic or leaf-like crystals as well as massive inclusions of bronze-yellow color.
Etymology and history
The mineral was first discovered in 1961 by EN Cameron, EN and IM Threadgold in the Good Hope Mine near Vulcan , Colorado . They named it after the place where it was found.
classification
In the Strunz system , vulcanite is counted among the metal sulfides with a ratio of metal to sulfur, selenium or tellurium of 1: 1. After the 8th edition, it forms its own group. In the 9th edition , it forms a separate subgroup of sulfides with zinc , iron , copper or silver .
In the Dana system , it forms its own subgroup of sulfides, selenides and tellurides with the composition A m B n X p , with (m + n): p = 1: 1.
Education and Locations
Vulcanite forms together with other telluride ores. It is associated with rickardite , tellurium , petzite and sylvanite .
Only seven sites are known of the very rare mineral (as of July 2010). In addition to the type locality , Vulcanite was found on the Greek island of Tinos , Iriki on the Japanese island of Kyushu , Kautokeino in Norway , the province of Medina in Saudi Arabia and the Kamchatka Peninsula in Russia .
Crystal structure
Vulcanite crystallizes in the orthorhombic crystal system in the space group Pmnm (space group no. 59) with the lattice parameters a = 4.09 Å , b = 6.95 Å and c = 3.15 Å as well as two formula units per unit cell .
See also
Individual evidence
literature
- Vulcanit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( PDF ).