Roquesite
| Roquesite | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1962-001 |
| chemical formula | CuInS 2 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.10a ( 8th edition : II / C.03) 02.09.01.04 |
| Crystallographic Data | |
| Crystal system | tetragonal |
| Crystal class ; symbol | tetragonal-scalenohedral; 4 2 m |
| Space group | I 4 2 d (No. 122) |
| Lattice parameters | a = 5.51 Å ; c = 11.05 Å |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | not defined (VHN 25 : 259 to 274 kg / mm 2 ) |
| Density (g / cm 3 ) | calculated: [4.78] |
| Cleavage | Please complete |
| colour | bluish gray |
| Line color | Please complete |
| transparency | opaque |
| shine | Metallic luster |
Roquesite is a rarely occurring mineral from the mineral class of " sulfides and sulfosalts " with the composition CuInS 2 and is therefore chemically a copper - indium sulfide.
Roquesite crystallizes in the tetragonal crystal system , but develops only microscopic crystals up to about 0.3 millimeters in diameter, bluish-gray in color and metallic luster , which are mostly found in the form of inclusions in other sulfides.
Etymology and history
Roquesite was first discovered in the “Charrier” mine near Laprugne in the French Allier department and described in 1963 by P. Picot and R. Pierrot, who named the mineral after the French geologist Maurice Roques (* 1911).
Type material of the mineral was deposited in the Mines ParisTech (also École des mines de Paris , English National School of Mines ) in Paris and in the Natural History Museum in London (register no. 1965,302).
classification
In the meanwhile outdated, but still in use 8th edition of the mineral classification according to Strunz , the Roquesite belonged to the division of "Sulphides with the molar ratio of metal: S, Se, Te ≈ 1: 1", where together with Chalcopyrite , Eskebornite , Gallit , Laforêtit and Lenait the "Chalcopyrite Group" with the system no. II / C.03 formed.
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also classifies Roquesite in the category of "Metal sulfides, M: S = 1: 1 (and similar)". However, this section is further subdivided according to the predominant metals in the compound, so that the mineral can be found in the sub-section "with zinc (Zn), iron (Fe), copper (Cu), silver (Ag) etc." according to its composition is where, together with chalcopyrite, eskebornite, gallite, laforêtite and lenaite, the "chalcopyrite group" with the system no. 2.CB.10a forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking area , assigns the Roquesite to the “sulfide minerals” division and there to the “chalcopyrite group” with system no. 02.09.01 to be found within the subsection of " Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 1: 1 ".
Crystal structure
Roquesite crystallizes isotypically with chalcopyrite in the tetragonal crystal system in the space group I 4 2 d (space group no. 122) with the lattice parameters a = 5.51 Å and c = 11.05 Å and 4 formula units per unit cell .
Education and Locations
Roquesite forms hydrothermally in zinc, tungsten, bismuth and molybdenum-containing, highly metamorphic rocks. As Begleitminerale occur among other arsenopyrite , native bismuth , bornite , chalcopyrite , covellite , Cubanit , Emplectit , Ferberite , cassiterite , Löllingit , magnetite , pyrite , sphalerite , Stannoidit , tetrahedrite and Wittichenite .
As a rare mineral formation, Roquesite has so far (as of 2012) only been proven at a few sites, with around 30 sites being known. Besides its type locality pit "Charrier" in Laprugne (Auvergne) the mineral in France occurred even at La Telhaie in the Morbihan department (Brittany), in the copper deposit at Vaulry in Canton Nantiat (Limousin) and in the pit "Les Clochettes" at Villar-d'Arêne in the Hautes-Alpes department (Provence-Alpes-Côte d'Azur).
Roquesite was found near Cínovec (German Zinnwald ) in the Ore Mountains in the German-Czech border region between Saxony and Bohemia .
Other locations include San Vicente (Potosí) in Bolivia, in the Brazilian municipality of Monte Alegre de Goiás , near Bhiwani in the Indian state of Haryana , in the "Toyoha" mine near Sapporo on Hokkaidō and in several places on Honshū in Japan the pits " Mount Pleasant " in Charlotte County (New Brunswick) and "Kidd Creek" near Timmins (Ontario) in Canada, on the islands of Iturup and Kunaschir as well as near Pervomaiski (Chelyabinsk) in the Urals in Russia, near Gåsborn and Långban in Sweden, at Gemerská Poloma in Slovakia, at Ulsan in South Korea, at Březové Hory (German Birkenberg ), Příbram in the Czech Republic, at the St Just in Penwith (England) pit "Pendeen" in the United Kingdom and at Pyramid in Washoe County in the US - State of Nevada.
use
Except as a mineral sample, roquesite has no technical significance. It is rarely used to extract the otherwise very valuable indium .
See also
literature
- Friedrich Klockmann : Klockmann's textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke, Stuttgart 1978, ISBN 3-432-82986-8 , pp. 432 (first edition: 1891).
- JK Sutherland, RS Boorman: 'A new occurrence of Roquesite at Mount Pleasant, New Brunswick . In: American Mineralogist . tape 54 , 1969, p. 1202–1203 ( minsocam.org [PDF; 123 kB ]).
Web links
- Mineral Atlas: Roquesite (Wiki)
Individual evidence
- ↑ Webmineral - Roque Site
- ^ A b c Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 77 .
- ↑ a b c d John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols: Roquesite , in: Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 62.3 kB )
- ↑ Mindat - Number of localities for Roquesite
- ^ Mindat - Roquesite