Sakuraiit
| Sakuraiit | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1965-017 |
| chemical formula | (Cu, Zn, In, Fe, Sn) 4 S 4 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.CB.05b ( 8th edition : II / C.06) 02.09.02.05 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | 432, 4 3 m or m 3 m |
| Space group | P 4 3 m |
| Lattice parameters | a = 5.46 Å |
| Formula units | Z = 1 |
| Physical Properties | |
| Mohs hardness | 4th |
| Density (g / cm 3 ) | 4.45 (calculated) |
| Cleavage | is missing |
| colour | greenish gray |
| Line color | lead gray |
| transparency | opaque |
| shine | metallic |
Sakuraiite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the cubic crystal system with the chemical composition (Cu, Zn, In, Fe, Sn) 4 S 4 and forms greenish-gray grains.
Etymology and history
The mineral was first found in 1965 by Akira Kato in the Ikuno mine near Asago in Japan . He first determined a tetragonal and pseudocubic structure with the composition (Cu, Zn, Fe) 3 (In, Sn) S 4 and saw the mineral as an indium analogue of kesterite . In 1986 Stephen Kissin and D'Alton Owens corrected this to a cubic-primitive structure after a more precise crystal structure analysis.
The mineral is named after the Japanese amateur mineralogist Kin-ichi Sakurai.
classification
In the Strunz system , sakuraiite 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 barquitasite , briartite , černýit , famatinite , ferrokësterite , hocartite , kësterite , kuramite , luzonite , permingeatite , petrukite , pirquitasite , rhodostannite , stannite , toyohaite and velikite . In the ninth edition , the sulfides are also subdivided according to cations, where sakuraiite forms a subgroup of metal sulfides with a ratio of metal to sulfur, selenium or tellurium of 1: 1 with coloradoite , hawleyite , metacinnabarite , polhemusite , rudashevskyite , sphalerite , stilleit and tiemannite and zinc , iron , copper or silver .
In the systematics of minerals according to Dana , it forms with stannite, černýite, briartite, kuramite, hocartite, pirquitasite, velikite, kësterite, ferrokësterite and barquillite the stannite subgroup of sulphides - including selenides and tellurides - with the composition Am Bn Xp, with ( m + n): p = 1: 1.
Education and Locations
Sakuraiite forms under hydrothermal conditions. It is associated with stannite, sphalerite, chalcopyrite, cassiterite , matildite , cobalt arsenopyrite , quartz and calcite .
In addition to the type locality , finds are only known from the Toyoha mine near Sapporo in Japan and Mina Pirquitas in the Argentine province of Jujuy .
Crystal structure
Sakuraiite crystallizes in the cubic crystal system in the space group P 4 3 m , P 432 or Pm 3 m with the lattice parameter a = 5.46 Å and one formula unit per unit cell .
See also
Individual evidence
- ↑ a b c d e f Stephen Kissin, D'Alton Owens: The Crystallography of Sakuraiite. In: Canadian Mineralogist. 1986, 24, pp. 679-683 ( full text ; PDF; 640 kB).
- ↑ Akira Kato: Sakuraiite, a new mineral. In: Chigaku Kenkyu. Sakurai volume, 1–5 (Japanese, abstract in American Mineralogist ; PDF; 505 kB).
- ^ List of minerals according to Dana at webmineral.com
literature
- Sakuraiit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).
