Rinneit
| Rinneit | |
|---|---|
 |
|
| General and classification | |
| chemical formula | K 3 NaFe 2+ Cl 6 |
|
Mineral class (and possibly department) |
Halides |
|
System no. to Strunz and to Dana |
3.CJ.05 ( 8th edition : III / C.06) 05/11/03/01 |
| Crystallographic Data | |
| Crystal system | trigonal |
| Crystal class ; symbol | ditrigonal-scalenohedral; 3 m |
| Space group | R 3 c |
| Lattice parameters | a = 11.98 Å ; c = 13.84 Å Please complete the source as an individual reference |
| Formula units | Z = 6 Please complete the source as an individual reference |
| Twinning | along {0001} |
| Physical Properties | |
| Mohs hardness | 3 |
| Density (g / cm 3 ) | 2,347 |
| Cleavage | Please complete |
| Break ; Tenacity | splintery, mussel-like |
| colour | pure colorless, colorless, pink, violet, brown, yellow |
| Line color | White |
| transparency | translucent |
| shine | silky |
| Crystal optics | |
| Refractive indices |
n ω = 1.589 n ε = 1.589 |
Rinneit is a very rare mineral from the mineral class of halides . It crystallizes in the trigonal crystal system with the chemical formula K 3 NaFe 2+ Cl 6 and rarely forms idiomorphic crystals, mostly massive grains that are transparent and colorless in their pure state, otherwise pink, violet, brown or yellow. It is isostructural to chloromanganocalite .
Special properties
The mineral is soluble in water. In ethanol it decomposes to form ferric chloride .
Etymology and history
Rinneit was first found in 1909 by HE Boeke in the type locality Wolkramshausen in Thuringia ( Germany ). It was named after the German mineralogist and crystallographer Friedrich Rinne .
classification
Rinneit belongs to the mineral class of halides. In the 8th edition of the Strunz system , it forms a subgroup of the hydrous double halides with chlorine manganocalite . In the 9th edition, it is one of the complex halides and, together with chloromanganocalite, forms a subgroup of the halides with MX 6 complexes, where M can be iron , manganese or copper .
In the Dana system , it forms a separate subgroup of the complex halides - aluminum fluorides with the formula (A) m B (X) 6 .
Education and Locations
Rinneit is found in salt deposits that have formed when parts of the sea dried up. It is a secondary mineral in evaporite deposits . Rinneit can also form as a sublimate in volcanoes . The mineral is associated with halite , sylvine , kieserite , carnallite , langbeinite and anhydrite .
Finds of the mineral are mainly known from Germany. There it was found in various salt deposits in Hänigsen , Wathlingen , Diekholzen , Groß Giesen and Schwarmstedt in Lower Saxony , Stassfurt in Saxony-Anhalt and Wolkramshausen and Bad Salzungen in Thuringia . Other sites are the Iranian province of Hormozgan , Mount Vesuvius in Italy , Eskdale in England and Austin County in Texas , United States .
Crystal structure
Rinneit crystallizes in the trigonal crystal system in the space group R 3 c with the lattice parameters a = 11.98 Å and c = 13.84 Å, as well as six formula units per unit cell .
See also
Individual evidence
literature
- Rinneit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )
