Hawleyite
| Hawleyite | |
|---|---|
 |
|
| General and classification | |
| chemical formula | CdS |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.05a ( 8th edition : II / C.01) 08/02/02/06 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | 4 3 m |
| Space group | F 4 3 m |
| Lattice parameters | a = 5.838 Å Please complete the source as an individual reference |
| Formula units | Z = 4 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 2.5 to 3 |
| Density (g / cm 3 ) | 4.87 (calculated) |
| Cleavage | Please complete |
| colour | light yellow |
| Line color | light yellow |
| transparency | Please complete |
| shine | Please complete |
Hawleyite , chemically β- cadmium sulfide, is a rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the cubic crystal system with the chemical composition CdS and forms light yellow, fine-grained powdery coatings on minerals such as sphalerite or siderite .
Etymology and history
The mineral was first discovered in 1954 by RJ Traill and JW Boyle at the Hector Calumet Mine in the Mayo area of Canada's Yukon Territory . They named it after the Canadian mineralogy professor James Edwin Hawley .
classification
In the Strunz system , hawleyite is a metal sulfide with a ratio of metal to sulfur, selenium or tellurium of 1: 1. After the 8th edition , together with Coloradoite , Stilleit , Rudashevskyite , Polhemusite , Sphalerite , Metacinnabarite and Tiemannite form the Sphalerite group. In the 9th edition it forms with these minerals and sakuraiite a subgroup of the sulfides with zinc , iron , copper or silver .
In the Dana systematics , it forms with Coloradoite, Stilleit, Rudashevskyite, Sphalerite, Metacinnabarite and Tiemannite the sphalerite subgroup of sulfides, selenides and tellurides with the composition A m B n X p , with (m + n): p = 1: 1.
Modifications and varieties
Hawleyite is dimorphic to greenockite , this is the hexagonal α-modification of cadmium sulfide in nature. This is comparable to the zinc analogues sphalerite (cubic) and wurtzite (hexagonal).
Education and Locations
Hawleyite is secondary to precipitation from meteoric water in crevices and fractures of the ore. It is associated with sphalerite, siderite and greenockite.
In addition to the type locality , Hawleyite was found in Broken Hill and Kambalda in Australia , the Montafon in Austria , Theux and Andenne in Belgium , the Tanco mine in Canada , Cerro Blanco and Caracoles in Chile , Komňa in the Czech Republic , Pinols in France , the Schauinsland in Germany , Laurion in Greece , Nagylápafõ in Hungary , Kolar in India , Killimor in Ireland , Gadoni in Italy , Konan in Japan , Te Aroha in New Zealand , Drammen in Norway , La Unión in Spain , Martigny in Switzerland , Tajikistan , Ashover found in England and several locations in the United States .
Crystal structure
Hawleyite crystallizes in the cubic crystal system in the space group with the lattice parameter a = 5.838 Å and four formula units per unit cell . The structure thus corresponds to the sphalerite structure.
See also
Individual evidence
- ^ RJ Traill and JW Boyle: Hawleyite, isometric cadmium sulphide, a new mineral. In: American Mineralogist. 1955, 40, pp. 555–559 ( full text ; PDF; 325 kB).
- ^ New Dana Classification of Sulfide Minerals
- ↑ Hawleyite at mindat.org (Eng.)
literature
- Hawleyite in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).
