Indit

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Indit
General and classification
chemical formula Fe 2+ In 2 S 4
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.DA.05 ( 8th edition : II / D.01)
02.10.01.12
Crystallographic Data
Crystal system cubic
Crystal class ; symbol hexakisoctahedral; m 3 m
Room group (no.) Fd 3 m (No. 227)
Lattice parameters a  = 10.62  Å
Formula units Z  = 8
Physical Properties
Mohs hardness 5
Density (g / cm 3 ) calculated: 4.588
Cleavage Please complete!
colour White
Line color black
transparency opaque
shine Metallic luster

Indite is a very rare mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the cubic crystal system with the chemical composition Fe 2+ In 2 S 4 , so it is an iron - indium sulfide.

So far, indite has only been found in the form of opaque, granular to massive mineral aggregates from 0.2 to 0.5 mm in size. The mineral is generally black, in polished areas also white and has a metallic sheen .

Etymology and history

Indit was first discovered in the Dzhalinda tin deposit in the Malyi-Khingan Mountains near Khabarovsk in Russia and described in 1963 by Alexandr Dimitrievich Genkin (1919-2010) and IV Murav'eva. It is named after its main component, the chemical element indium .

classification

In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the indite belonged to the mineral class of "sulphides and sulphosalts" and there to the department of "sulphides with a molar ratio of metal: sulfur, selenium, tellurium <1: 1", where he together with Bornhardtit , Cadmoindit , Carrollit , daubréelite , Fletcherit , Florensovit , greigite , Kalininit , linnaeite , Polydymit , Siegenit , Trüstedtit , Tyrrellit and Violarite the "Linneitgruppe" with the system number. II / D.01 formed.

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 indite to the class of “sulfides and sulfosalts”, but there in the department of “metal sulfides with M: S = 3 : 4 and 2: 3 “. This is further subdivided according to the exact molar ratio, so that the mineral can be found according to its composition in the sub-section "M: S = 3: 4", where it is found together with Bornhardtite, Cadmoindite, Carrollite, Cuproiridsite , Cuprorhodsite , Daubréelite, Ferrorhodsite , Fletcherit, Florensovit, greigite, Kalininit, linnaeite, Malanit , Polydymit, Siegenit, Trüstedtit, Tyrrellit, Violarite and Xingzhongit the "Linneitgruppe" with the system number. 2.DA.05 forms.

The systematics of the minerals according to Dana also assigns the indite to the class of "sulfides and sulfosalts" and there in the department of "sulfide minerals". Here it is together with linneit, carrollite, fletcherite, tyrrellite, bornhardtite, siegenite, polydymite, violarite, trüstedtite, greigite, daubréelite, kalininite, florensovite, cuproiridsite, cuprorhodsometrite, malanite, ferrorhodsite and cadmoindite in the "Isminneitite group": with the system no. 02.10.01 to be found in the subsection " Sulphides - including selenides and tellurides - with the composition AmBnXp, with (m + n): p = 3: 4 ".

Education and Locations

Indite is so far only known from two sites in the Far East of Russia , the type locality Dzhalinda tin deposit in the Malyi-Khingan Mountains and the Verkhnee deposit near Kawalerowo .

Crystal structure

Indite crystallizes in a cubic crystal system in the space group Fd 3 m (space group no. 227) with the lattice parameter a  = 10.62  Å and eight formula units per unit cell .

See also

literature

  • Ulrich Schwarz-Schampera, Peter M. Herzig: Indium: Geology, mineralogy, and economics. Springer, Berlin and New York 2002, ISBN 3-540-43135-7 .
  • Indite , In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 60 kB )

Web links

Individual evidence

  1. ^ A b c Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p.  94 .
  2. ↑ Alexandr Dimitrievich Genkin (1920–2010). In: The Canadian Mineralogist. Volume 48.5 (2010), p. 1317 doi : 10.3749 / canmin.48.5.1317 and Mindat - obituary for Aleksandr Dmitrievich Genkin (1919-2010) (English)