Mooihoekit
| Mooihoekit | |
|---|---|
| General and classification | |
| other names |
IMA 1971-019 |
| chemical formula | Cu 9 Fe 9 S 16 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.10 ( 8th edition : II / C.04) 09/02/08/03 |
| Crystallographic Data | |
| Crystal system | tetragonal |
| Crystal class ; symbol | 4 2 m |
| Space group | P 4 2 m |
| Lattice parameters | a = 10.585 Å ; c = 5,383 Å Please complete the source as an individual reference |
| Formula units | Z = 1 Please complete the source as an individual reference |
| Physical Properties | |
| Mohs hardness | 4th |
| Density (g / cm 3 ) | 4.36 |
| Cleavage | Please complete |
| colour | light yellow |
| Line color | black |
| transparency | opaque |
| shine | metallic |
Mooihoekite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in a tetragonal crystal system with the chemical composition Cu 9 Fe 9 S 16 and forms light yellow grains up to 1 mm in size that are fused with Haycockite .
Etymology and history
The mineral was first described in 1972 by Louis J. Cabri and Sydney R. Hall. The type material was found in 1929 by E. Sampson on the Mooihoek Farm near Lydenburg in the eastern Bushveld complex in South Africa . They named it after the place where it was found.
classification
In the Strunz system , Mooihoekit is classified as sulfides and sulfosalts. It is counted among the sulphides with a ratio of metal to sulfur, selenium or tellurium of 1: 1. In the eighth edition , it formed a group with haycockite , isocubanite , putoranite , orickite , talnakhite and wilhelmramsayite . In the ninth edition , the sulfides are also subdivided according to cations, where mooihoekite with chalcopyrite , eskebornite , haycockite, laforêtite , lenaite , putoranite, gallite , roquesite and talnakhite form a subgroup of metal sulfides with a metal to sulfur, selenium or tellurium ratio of 1 : 1 and zinc , iron , copper or silver .
In the system of minerals according to Dana , it forms with haycockite and talnakhite a subgroup of sulphides - including selenides and tellurides - with the composition Am Bn Xp, with (m + n): p = 1: 1.
Education and Locations
Mooihoekite forms in massive sulphides in dunite or troctolite . Depending on where it was found, it is associated with haycockite, magnetite , [troilite], copper pentlandite , mackinawit , sphalerite and monchite or haycockite, copper, troilite, pentlandite, cubanite and magnetite.
A total of 13 locations of the mineral are known. In addition to the type locality and other places in South Africa, Mooihoekit was found in Laurion in Greece , Balaghat in India , Berceto in Italy , Suwałki in Poland , Norilsk in Russia and Duluth ( Minnesota ) and Stillwater ( Montana ) in the United States .
Crystal structure
Mooihoekit crystallizes in the tetragonal crystal system in the space group with the lattice parameters a = 10.585 Å and c = 5.383 Å and one formula unit per unit cell .
See also
Individual evidence
- ↑ a b Mooihoekite at mindat.org (English)
- ↑ Louis J. Cabri, Sydney R. Hall: Mooihoekite and haycockite, two new copper-iron sulfides, and their relationship to chalcopyrite and talnakhite. In: American Mineralogist. 1972, 57, pp. 689-708 ( full text PDF ).
- ^ List of minerals according to Dana at webmineral.com
literature
- Mooihoekit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( PDF )
- Louis J. Cabri, Sydney R. Hall: Mooihoekite and haycockite, two new copper-iron sulfides, and their relationship to chalcopyrite and talnakhite. In: American Mineralogist. 1972, 57, pp. 689–708 ( full text PDF )