Polkovicit
| Polkovicit | |
|---|---|
| General and classification | |
| other names |
IMA 1974-037 |
| chemical formula | (Fe, Pb) 3 Ge 1-x S 4 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.35a ( 8th edition : II / C.10) 02.09.05.02 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | Please complete |
| Lattice parameters | a = 10.61 Å Please complete the source as an individual reference |
| Formula units | Z = 8 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 3.5 |
| Density (g / cm 3 ) | 6.62 |
| Cleavage | Please complete |
| colour | brownish gray |
| Line color | dark gray |
| transparency | opaque |
| shine | Please complete |
Polkovicit is a very rarely occurring mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the cubic crystal system with the chemical composition (Fe, Pb) 3 Ge 1-x S 4 and forms brownish-gray masses with other sulfides. It forms a series of mixed crystals with Morozeviczit , in which lead has been exchanged for iron .
Etymology and history
The mineral was first found in 1975 by Czeslaw Haranczyk in the Polkowice mine near Legnica in Poland . He named it after the place where it was found.
classification
In Strunz's system , Polkovicit 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 a group with colusite , germanite , maikainite , vinciennite , nekrasovite , ovamboite , morozeviczite , renierite , stibiocolusite , sulvanite and germanocolusite . In the 9th edition , it forms a subgroup of sulfides with zinc , iron , copper or silver with catamarcaite , hemusite , kiddcreekite , vinciennite, morozeviczite and renierite .
In the Dana systematics , it forms with morozeviczite a subgroup of sulphides, selenides and tellurides with a general formula A m B n X p and a ratio of (m + n) to p of 1: 1.
Education and Locations
Polkovicit is formed by metasomatosis of sandstone or older sulfides. It is associated with marcasite , chalcopyrite , bornite , chalcosine , tennantite , sphalerite and galena .
The mineral has so far only been found at the type locality in Poland.
Crystal structure
Polkovicit crystallizes in the cubic crystal system with the lattice parameter a = 10.61 Å and eight formula units per unit cell .
See also
Individual evidence
literature
- Polkovicit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).