Godlevskit

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Godlevskit
General and classification
other names

IMA 1968-032

chemical formula (Ni, Fe) 9 S 8
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.BB.15b ( 8th edition : II / B.17)
07/02/04/01
Crystallographic Data
Crystal system orthorhombic
Crystal class ; symbol orthorhombic-disphenoidic; 222
Room group (no.) C 222 (No. 21)
Lattice parameters a  = 9.34  Å ; b  = 11.22 Å; c  = 9.43 Å
Formula units Z  = 4
Physical Properties
Mohs hardness not defined ( Vickers hardness : 383 to 415 (40 to 50 g)
Density (g / cm 3 ) calculated: 5.273
Cleavage Please complete!
colour bronze yellow to light yellow
Line color Gray
transparency opaque
shine Metallic luster

Godlevskit (also Godlewskit ) is a rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the orthorhombic crystal system with the idealized composition (Ni, Fe) 9 S 8 (more precisely (Ni 8.7 Fe 0.3 ) S 8 ), so it is chemically a nickel - iron sulfide.

So far Godlevskit could only be found in the form of granular and mostly complex twinned crystals up to about a millimeter in size and granular aggregates . The color of the opaque crystals resembles a bronze-like yellow with a metallic sheen on the surfaces. In polished thin sections, it is more light yellow.

Etymology and history

Godlevskit was first discovered in the copper-nickel deposit between Norilsk and Talnach (English Talnakh) in Russia ( Eastern Siberia ) and described in 1969 by EA Kulagov, TL Evstigneeva and OE Yushko-Zakharova, who named the mineral after the Russian geologist Mikhail Nikolaevich Godlevskii ( 1902–1984) named.

classification

In the meanwhile outdated, but still in use 8th edition of the mineral classification according to Strunz , the Godlevskite belonged to the mineral class of "sulfides and sulfosalts" and there to the department of "sulfides with the molar ratio of metal: sulfur, selenium, tellurium> 1: 1", where together with Kharaelakhit and Mackinawit he formed the unnamed group II / B.17 .

The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also assigns the Godlevskit to the class of "sulfides and sulfosalts" and there in the department of "metal sulfides, M: S> 1: 1 (mainly 2: 1) ”. This division is, however, further subdivided according to the predominant metals in the compound, so that the mineral can be found according to its composition in the sub-division "with nickel (Ni)", where it is the only member of the unnamed group 2.BB.15b .

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Godlevskit to the class of "sulphides and sulphosalts" and there in the category of "sulphide minerals". Here he is the only member of the unnamed group 07/02/04 within the subdivision of " Sulphides - including selenides and tellurides - with the composition AmBnXp, with (m + n): p = 9: 8 ".

Education and Locations

Godlevskite forms either in hydrothermal veins or in peridotites together with other nickel sulfides. Accompanying minerals include bornite , chalcopyrite , Heazlewoodite , magnetite , millerite , pentlandite , pyrite and pyrrhotite .

As a rare mineral formation, Godlevskite has so far (as of 2012) only been proven at a few sites, with around 20 sites being known. In addition to its type locality Norilsk-Talnach, the mineral has so far only been found in Russia in the Yoko-Dovyrensky massif near Lake Baikal in the Republic of Buryatia .

Locations include Mount Clifford in Western Australia , Dobromirtsi near Goze Deltschew in Bulgaria, the Jianchaling gold deposit in Mian County in China, Qeqertarsuatsiaat in Greenland, the "Fukumaki Mine" near Kudamatsu in Japan, the "Texmont Mine" near Timmins and the " Orford Nickel Mine “near Saint-Denis-de-Brompton ( Le Val-Saint-François ) in Canada, near Bou Azer near Tazenakht in the Moroccan province of Ouarzazate , the Braszowice-Brzeźnica massif near Ząbkowice Śląskie (German: Frankenstein ) in Poland , the “New Amianthus Mine” near Barberton in South Africa, the “Dağküplü Mine” and the “Kavak Mine” near Eskişehir in Turkey and near Moapa in Clark County (Nevada) in the United States of America (USA).

Crystal structure

Godlevskit crystallizes orthorhombically in space group C 222 (space group no. 21) with the lattice parameters a  = 9.34  Å ; b  = 11.22 Å and c  = 9.43 Å and 4 formula units per unit cell .

See also

literature

Web links

Individual evidence

  1. ↑ Webmineral - Godlevskite
  2. ↑ a b c d Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p.  70 .
  3. ↑ a b c d John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols: Godlevskite , in: Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 61.4 kB )
  4. ↑ Hans Jürgen Rösler : Textbook of Mineralogy . 4th revised and expanded edition. German publishing house for basic industry (VEB), Leipzig 1979, ISBN 3-342-00288-3 , p.  319 .
  5. ↑ Stefan Weiß: The large Lapis mineral directory. All minerals from A - Z and their properties . 5th completely revised and supplemented edition. Weise, Munich 2008, ISBN 978-3-921656-70-9 .
  6. ↑ Mindat - Number of locations for Godlevskit
  7. ^ Mindat - Godlevskite