Maikainite
| Maikainite | |
|---|---|
| General and classification | |
| other names |
IMA 1992-038 |
| chemical formula | Cu 10 Fe 3 MoGe 3 S 16 |
|
Mineral class (and possibly department) |
Sulfides, sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.30 ( 8th edition : II / C.10) 02.09.04.03 |
| Similar minerals | Ovamboite , colusite |
| Crystallographic Data | |
| Crystal system | Cubic |
| Crystal class ; symbol | cubic-hexakisoctrahedral; 4 3 m |
| Room group (no.) | P 4 3 n (No. 218) |
| Lattice parameters | a = 10.64 Å |
| Formula units | Z = 1 |
| Physical Properties | |
| Mohs hardness | 4th |
| Density (g / cm 3 ) | 4.54 ( VHN 30 = 275 to 345 kg / mm²) |
| Cleavage | no |
| colour | yellow |
| Line color | Please complete |
| transparency | opaque |
| shine | Metallic luster |
Maikainite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the cubic crystal system with the composition Cu 10 Fe 3 MoGe 3 S 16 , so chemically speaking it is a copper - iron - molybdenum - germanium sulfide.
Maikainite is opaque and has so far only been found in the form of microscopic, octahedral or rhombic dodecahedral crystals and rounded grains of yellow color and metallic sheen .
Etymology and history
Maikainit is named after the type locality , the Maikain gold deposit in Kazakhstan . The mineral was first described in 2003 by EM Spiridonov.
classification
In the 8th edition of the mineral systematics according to Strunz , which is now outdated but still in use , maikainite belonged to the division of "Sulphides with the molar ratio of metal: S, Se, Te ≈ 1: 1", where it was used together with colusite , germanite , germanocolusite , morozeviczite , Nekrasovit , Ovamboit , Polkovicit , Renierit , Stibiocolusit , Sulvanit and Vinciennit the "Colusit-Gruppe" with the system no. II / C.10 formed.
The 9th edition of Strunz's mineral systematics, which has been in force since 2001 and is used by the International Mineralogical Association (IMA), also classifies maikainite in the category of "Metal sulfides, M: S = 1: 1 (and similar)". However, this 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 , where together with colusite, germanite, germanocolusite, nekrasovite, ovamboite and stibiocolusite the "germanite group" with the system no. 2.CB.30 forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns maikainite to the class of "sulphides and sulphosalts" and there in the category of "sulphide minerals". Here it is together with renierite, germanite and ovamboite in the " germanite group " with the system no. 02.09.04 within the subsection "Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 1: 1".
Education and Locations
Maikainite was found enclosed in ovamboite and as an overgrowth of colusite . The mineral assemblage also includes the minerals sphalerite , bornite and barite . Maikainit forms Ovamboit a continuous series of solid solutions represented by the substitution of molybdenum by tungsten and additional variations in the occupancy of the iron - copper - lattice site is marked.
In addition to the first discovery in Kazakhstan, maikainite has so far only been discovered in the geologically similar Tsumeb deposit in Namibia.
Crystal structure
Maikainite crystallizes cubically in the space group P 4 3 n (space group no. 218) with the lattice parameter a = 10.64 Å and one formula unit per unit cell .
See also
literature
- EM Spiridonov: Maikainite Cu 20 (Fe, Cu) 6 Mo 2 Ge 6 S 32 and ovamboite Cu 20 (Fe, Cu, Zn) 6 W 2 Ge 6 S 32 : new minerals in massive sulfide base metal ores , in: Doklady Earth Sciences , Vol 393A (2003), pp. 1329-1332
- Mineralogical Association of Canada - Maikainite (data sheet, PDF 18.8 kB)
- JL Jambor, AC Roberts (2004): New Mineral Names . The American Mineralogist 89, p. 1830 ( PDF 453 kB ; p. 5)
Web links
- Mineral Atlas: Maikainite (Wiki)
- Webmineral - Maikainite (English)
- Mindat - Maikainite (Engl.)
Individual evidence
- ↑ a b IMA / CNMNC List of Mineral Names 2012 (PDF; 1.6 MB)
- ↑ a b c Mineralogical Association of Canada - Maikainite ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (Data sheet, PDF 18.8 kB)
