Khatyrkit

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Khatyrkit
Khatyrkite sample.png
Samples of Khatyrkit from the collection of the Museo di Storia Naturale , Florence
General and classification
other names

IMA 1983-085

chemical formula
  • CuAl 2
  • (Cu, Zn) Al 2
Mineral class
(and possibly department)
Elements - metals and intermetallic alloys
System no. to Strunz
and to Dana
1.AA.15 ( 8th edition : I / A.03)
01.01.15.02
Crystallographic Data
Crystal system tetragonal
Crystal class ; symbol 4 / mmmTemplate: crystal class / unknown crystal class
Space group I 4 / mcm (No. 140)Template: room group / 140
Lattice parameters a  = 6.07  Å ; c  = 4.89 Å
Formula units Z  = 4
Physical Properties
Mohs hardness 5 to 5.5
Density (g / cm 3 ) calculated: 4.42
Cleavage clearly after {100}
Break ; Tenacity deformable
colour steel gray, yellowish gray
Line color dark gray
transparency opaque
shine Metallic luster

Khatyrkite is a very rare mineral from the mineral class of elements, more precisely metals and intermetallic compounds. It crystallizes in the tetragonal crystal system with the chemical composition CuAl 2 and forms prismatic grains up to 400 μm in length and adhesions in the form of small grains with cupalite .

Etymology and history

Khatyrkit was first found in 1985 by LV Razin and NS Rudashevskij and LN Vyalsov in the type locality in the Koryak Autonomous Okrug in the Far East of Russia . It is named after the type locality, the Khatyrkit rock zone.

classification

Already in the outdated, but still in use 8th edition of the mineral classification according to Strunz , the khatyrkite belonged to the mineral class of "elements" and there to the department of "metals and intermetallic alloys (without semimetals)", where together with aluminum and cupalite it belongs to the unnamed group I / A.03 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 classifies the khatyrkite in the “Metals and Intermetallic Compounds” section. However, this is further subdivided according to the predominant metals in the compound, which have been divided into metal families according to their related properties. Khatyrkit can be found here according to its composition in the subdivision "Copper Cupalit Family", where it forms the unnamed group 1.AA.15 together with Anyuiit and Novodneprit .

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the khatyrkit to the class and there in the department of the same name of "elements". Here he can be found together with Cupalit in the unnamed group 01.01.15 within the sub-section "Elements: Metallic elements except the platinum group".

Crystal structure

Crystal structure of khatyrkite

Khatyrkite crystallizes in the tetragonal crystal system in the space group I 4 / mcm (space group no. 140) with the lattice parameters a = 6.07  Å and c = 4.89 Å, as well as four formula units per unit cell . Template: room group / 140

Education and Locations

Khatyrkite is found in alluvial deposits that were formed when serpentinite was washed out . It is associated with Cupalit and other zinc - aluminum alloys. Finds are so far only known from the type locality.

See also

literature

  • LV Razin, NS Rudashevskij, LN Vyalsov: New natural intermetallic compounds of aluminum, copper and zinc - khatyrkite CuAl, cupalite CuAl and zinc aluminides - from hyperbasites of dunite-harzburgite formation . In: Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva . tape 114 , no. 1 , 1985, pp. 90-100 .
  • Frank C. Hawthorne, Michael Fleischer, Edward S. Grew, Joel D. Grice, John L. Jambor, Jacek Puziewicz, Andrew C. Roberts, David A. Vanko, Janet A. Zilczer: New Mineral Names . In: American Mineralogist . tape 71 , no. 9-10 , 1986, pp. 1277–1282 ( minsocam.org [PDF; 793 kB ; accessed on February 26, 2018]).

Web links

Commons : Khatyrkite  - collection of images, videos and audio files

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.  36 .
  2. ^ IMA / CNMNC List of Mineral Names; November 2017 ( Memento from April 17, 2018 in the Internet Archive ) (PDF 1.67 MB)
  3. a b c d Khatyrkite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 60  kB ; accessed on February 26, 2018]).
  4. a b c Stefan Weiss: The large Lapis mineral directory. All minerals from A - Z and their properties . 6th completely revised and supplemented edition. Weise, Munich 2014, ISBN 978-3-921656-80-8 .