Fizélyite
| Fizélyite | |
|---|---|
 (size: 13.5 × 7.5 × 2.8 cm) |
|
| General and classification | |
| chemical formula | Pb 14 Ag 5 Sb 21 S 48 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.JB.40a ( 8th edition : II / E.23) 04/03/15/08 |
| Crystallographic Data | |
| Crystal system | monoclinic |
| Crystal class ; symbol | monoclinic prismatic; 2 / m |
| Space group | P 2 1 / n (No. 14, position 2) |
| Lattice parameters |
a = 19.2767 Å ; b = 13.2345 Å; c = 8.7230 Å β = 90.401 ° |
| Formula units | Z = 1 |
| Twinning | polysynthetic twins according to {010} |
| Physical Properties | |
| Mohs hardness | 2 |
| Density (g / cm 3 ) | measured: 5.56; calculated: 5.224 |
| Cleavage | after {010} |
| Break ; Tenacity | brittle and fragile |
| colour | lead gray to steel gray |
| Line color | dark gray |
| transparency | opaque |
| shine | Metallic luster |
Fizélyite is a rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the monoclinic crystal system with the chemical composition Pb 14 Ag 5 Sb 21 S 48 and structurally belongs to the sulfosalts with lead , silver and antimony .
Fizélyite is opaque in every form and only develops small, prismatic crystals up to about 12 millimeters in length, which are strongly striped and very brittle and fragile. Its color varies between lead gray and steel gray and its line color is also dark gray.
Etymology and history
Fizélyite was first discovered in the "Herja mine" near Chiuzbaia in the Romanian Maramureș district and described in 1923 by József Krenner and József Loczka, who named the mineral after the Hungarian mining engineer and discoverer of the mineral Sándor Fizély (1856-1918).
classification
In the meanwhile outdated, but still in use 8th edition of the mineral classification according to Strunz , the fizélyite belonged to the department of "sulfosalts (S: As, Sb, Bi = x)", where it together with andorite IV (formerly andorite ), ramdohrite , roshchinite and Uchucchacuait formed the unnamed group II / E.23 .
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), classifies fizélyite in the newly defined department of “sulfosalts with PbS as a model”. This section is further subdivided according to the corresponding model and its modification ( derivative ), so that the mineral can be found in the sub-section “Galena derivatives with lead (Pb)” according to its composition, where it can be found together with Andorite IV, Andorite VI , Gustavit , Lillianit , Ramdohrit, Roshchinit, Treasurit , Uchucchacuait, Vikingit and Xilingolit the "Lillianitgruppe" with the system no. 2.JB.40a forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns fizélyite to the class of "sulfides and sulfosalts" and there in the department of "sulfosalts". Here it is together with andorite, bursaite, gustavite, lillianite, ramdohrite, roshchinite and uchucchacuaite in the " Lillianite group (Orthorhombic, with the composition A m B n S 6 with A = Pb, Ag, Mn and B = Sb, Bi) " with the system no. 03.04.15 within the sub-section “ Sulphosalts with the ratio 3> z / y and the composition (A + ) i (A 2+ ) j [B y C z ], A = metals, B = semi-metals, C = non-metals" Find.
Crystal structure
Fizélyite crystallizes monoclinically in the space group P 2 1 / n (space group no. 14, position 2) with the lattice parameters a = 19.2767 Å ; b = 13.2345 Å; c = 8.7230 Å and β = 90.401 ° as well as one formula unit per unit cell .
Education and Locations
Fizélyite is formed by hydrothermal processes in lead and zinc ore deposits . As Begleitminerale occur among other dolomite , galena , pyrite , pyrrhotite , quartz , Semseyit and sphalerite on.
As a rare mineral formation, Fizélyite could only be detected at a few sites, whereby so far (as of 2012) around 50 sites are known. In addition to its type locality "Grube Herja" near Chiuzbaia , the mineral was also found in Romania in the nearby tunnel "Dealul Crucii" (German: Kreuzberg ) and at Baia Sprie ( Felsöbánya , Hungarian Nagybánya ) in the Maramureș district.
Previously known sites in Germany are Haslach in the Kinzigtal (Baberast) and the "Grube Ludwig" in the Adlersbachtal near Hausach in Baden-Württemberg and the "Grube Claus-Friedrich" near Sankt Andreasberg in Upper Harz in Lower Saxony.
Other locations are in Argentina, Bolivia, China, France, Italy, Canada, Russia, Slovakia, Tajikistan, the Czech Republic, Hungary and the United States of America (Colorado, California and Nevada).
See also
literature
- József Krenner, József Loczka: Fizélyit, egy új magyar ezüstérc , in: Matematikai és Természettudományi Értesitö , Volume 40 (1923), pp. 18-21 ( PDF 331.8 kB , Hungarian)
- Hexiong Yang, Robert T. Downs, Jason B. Burt, Gelu Costin: Structure refinement of an untwinned single crystal of Ag-excess Fizélyite Ag 5.94 Pb 13.74 Sb 20.84 S 48 , in: The Canadian Mineralogist , Volume 47 (2009), p . 1257-1264 doi : 10.3749 / canmin.47.5.1257
Web links
Individual evidence
- ^ A b Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 142 .
- ↑ a b c Webmineral - Fizélyite
- ↑ a b c American Mineralogist Crystal Structure Database - Fizélyite
- ↑ a b c d Fizélyite , in: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (eds.): Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 63.7 kB )
- ↑ Mindat - Number of localities for Fizélyite
- ^ Mindat - Fizélyite