Anduoite
| Anduoite | |
|---|---|
| General and classification | |
| chemical formula | (Ru, Os) As 2 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.EB.15 ( 8th edition : II / D.20) 02.12.02.08 |
| Crystallographic Data | |
| Crystal system | orthorhombic |
| Crystal class ; symbol | rhombic-pyramidal ( mm 2) / rhombic-dipyramidal (2 / m 2 / m 2 / m ) |
| Space group | Pnnm |
| Lattice parameters | a = 5.41 Å ; b = 6.2 Å; c = 3.01 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 | 6.5 to 7 |
| Density (g / cm 3 ) | 8,692 (calculated) |
| Cleavage | at least one known |
| colour | matt lead gray-metallic / pink-white under reflected light |
| Line color | grey black |
| transparency | Please complete |
| shine | metallic |
Anduoite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the orthorhombic crystal system with the chemical composition (Ru, Os) As 2 and develops predominantly massive crystals or granular aggregates up to a size of 60 to 100 µm with a lead-gray-metallic color that appear pink-white in reflected light.
Anduoite is isomorphic to omeiite ((Os, Ru) As 2 ). It is optically anisotropic with a color change from reddish or greenish yellow to gray-green, pale green or pale red.
Etymology and history
Anduoite ( Chinese 安 多 矿 , Pinyin Anduokuang , ore from Anduo) was described by Yu and Zhou in 1979.
classification
According to the systematics of minerals according to Strunz (8th edition) the mineral is in the mineral class of sulfides and sulfosalts in the marcasite group (II / D.20) and classification of minerals according to Strunz (9th edition) in the same mineral class in lollingite -Group classified. The systematics of minerals according to Dana puts the anuite to the sulfides with the general formula A m B n X p , with (m + n): p = 1: 2, it has the key 2.12.2.8.
Education and Locations
The mineral was first in the chrome - deposit of Amdo (Anduo) in Tibet found where it converted dunite occur. There it occurs in the form of very rare crystals in chromium spinels with a large number of other chromium, sulfide and platinum minerals. In addition to the type locality, other finds from Outokumpu in Finland, Albania and the Dnipropetrovsk Oblast in Ukraine are known.
Crystal structure
Anduoite crystallizes in the orthorhombic crystal system in the space group Pnnm with the lattice parameters a = 5.41 Å , b = 6.2 Å and c = 3.01 Å, as well as two formula units per unit cell .
See also
Individual evidence
- ↑ a b Mineralienatlas: Anduoite
- ↑ a b data sheet Anduoit , Mindat.org
- ↑ Fleischer et al. 1980
literature
- Yu Zuxiang and Zhou Xuezi : Anduoite , a new ruthenium arsenide . In: Kexue Tongbao [Chinese Science Bulletin], Vol. 24, No. 15, pp. 704-708, 1979 (Chinese)
- Michael Fleischer, LJCabri, GYChao, Adolf Pabst: New Minerals. Anduoite American Mineralist 1980, Vol. 65, pp. 808–809 (PDF file; 835 kB)
- Anduoit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )
Web links
- Data sheet Anduoit , Webmineral.com
- Mineral Atlas: Anduoite