Famatinit

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Famatinit
Famatinite, Pyrite-418696.jpg
Famatinite (gray) and pyrite from the Pen-Shan ore body of the Chinkuahshih mine, Jui-Fang, Taipei County , Taiwan (size: 5.3 × 5.0 × 3.7 cm)
General and classification
other names

Stibioluzonite

chemical formula Cu 3 SbS 4
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.KA.10 ( 8th edition : II / C.06)
02/03/02/02
Crystallographic Data
Crystal system tetragonal
Crystal class ; symbol tetragonal-scalenohedral; 4 2 m
Space group I 4 2 m (No. 121)Template: room group / 121
Lattice parameters a  = 5.38  Å ; c  = 10.76 Å
Formula units Z  = 2
Physical Properties
Mohs hardness 3.5
Density (g / cm 3 ) measured: 4.635; calculated: 4.66
Cleavage good after {101}, clearly after {100}
Break ; Tenacity uneven to shell-like; brittle
colour dark brownish purple
Line color black
transparency opaque
shine Metallic gloss to matt

Famatinit is a rather seldom occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the tetragonal crystal system with the composition Cu 3 SbS 4 , and is thus chemically seen a copper - Sulfoantimonat .

Famatinit is opaque in every form and rarely develops small crystals in crusty coatings. Usually it is found in the form of granular to massive aggregates of dark brownish-violet color with black streak color . Fresh samples initially have a metallic sheen , but then become matt as the weathering progresses.

With luzonite (Cu 3 AsS 4 ), famatinite forms a mixed crystal row .

Etymology and history

Famatinit was first discovered in the Sierra de Famatina east of the Argentine Andes and described in 1873 by Alfred Wilhelm Stelzner , who named the mineral after its type locality .

classification

Already in the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the Famatinit belonged to the mineral class of "sulfides and sulfosalts" and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 barquillite , briartite , černýite , ferrokësterite , hocartite , kësterite , kuramite , luzonite , permingeatite , petrukite , pirquitasite , rhodostannite , sakuraiite , stannite , toyohaite and velikite, the " stannite group " with the system no. II / C.06 formed.

The 9th edition of Strunz's mineral systematics, which has been in force since 2001 and is used by the International Mineralogical Association (IMA), also assigns Famatinit to the class of “sulfides and sulfosalts”, although there it is in the newly defined section of “ sulfarsenates ”. In addition, the sulfarsenates are further subdivided, depending on whether the compound is built up via (As, Sb) S 4 tetrahedra or with additional sulfur. According to its composition, the mineral can therefore be found in the sub-section “Sulpharsenates with (As, Sb) S 4 tetrahedra”, where together barquillite, briartite, luzonite and permingeatite the “luzonite group” with the system no. 2.KA.10 forms.

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Famatinit to the class of “sulfides and sulfosalts”, but there it is in the “sulfosalts” category. Here it is together with luzonite and permingeatite in the "luzonite group" with system no. 02/03/02 within the sub-section " Sulphosalts with the ratio z / y = 4 and the composition (A + ) i (A 2+ ) j [B y C z ], A = metals, B = semi-metals, C = non-metals " Find.

Crystal structure

Famatinit crystallizes tetragonally in the space group I 4 2 m (space group no. 121) with the lattice parameters a  = 5.38  Å and c  = 10.76 Å as well as two formula units per unit cell . Template: room group / 121

Education and Locations

Famatinit forms similar to Luzonit in copper, arsenic and antimony-rich, low to moderate hydrothermal - veins , where he next to this and Enargite still with many other sulphides associated may occur such as, but Bismuthinit , chalcopyrite , covellite , marcasite , pyrite , Sphalerite , tetrahedron and tennantite , the sulfate barite , quartz , which is also mostly present, as well as solid silver and gold .

As a rather seldom occurring mineral formation, Famatinite can sometimes be abundantly present at different sites, but overall it is not very common. So far (as of 2012) around 120 sites are known worldwide. In addition to its type locality Sierra de Famatina in the province of La Rioja , the mineral was also found in Argentina in the "Capillitas Mine" in the Andalgalá department (Catamarca), near El Guaico in the Minas department (Córdoba) and in the " El Quevar Mine", the " Armonía Mine ”and the“ Julio Verne Mine ”( Salta ).

In Germany, the mineral has so far only been found in the Clara mine in Baden-Württemberg, the Bayerland mine near Waldsassen in Bavaria, the Lüderich mine near Altenbrück and the copper mines near Marsberg in North Rhine-Westphalia and near Sadisdorf in Saxony.

In Austria, Famatinit has so far mainly been found in the vicinity of the Tyrolean communities Brixlegg and Rattenberg , but also performed on the Hüttenberger Erzberg in Carinthia and in the Schwarzleograben near Hütten / Leogang in Salzburg.

Other locations are in Australia, Bolivia, Bulgaria, Chile, China, France, Greece, Greenland, Indonesia, Italy, Japan, Canada, Kazakhstan, Macedonia, Mexico, Namibia, Papua New Guinea, Peru, Philippines, Russia, Slovakia, Spain, South Africa, Taiwan, Tunisia, Hungary, Uzbekistan, the United Kingdom (Great Britain) and the United States of America (USA).

See also

literature

  • Alfred Stelzner: Mineralogical observations in the area of ​​the Argentine Republic . In: Mineralogical communications . tape 4 , 1873, p. 219–254 ( rruff.info [PDF; 3.1 MB ; accessed on June 20, 2019]).
  • Richard V. Gaines: Luzonite, Famatinite and some related Minerals . In: The American Mineralogist . tape 42 , 1957 ( rruff.info [PDF; 896 kB ; accessed on June 20, 2019]).
  • Friedrich Klockmann : Klockmann's textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke, Stuttgart 1978, ISBN 3-432-82986-8 , pp. 438 (first edition: 1891).
  • Hans Jürgen Rösler : Textbook of Mineralogy . 4th revised and expanded edition. German publishing house for basic industry (VEB), Leipzig 1987, ISBN 3-342-00288-3 , p. 348 .
  • Helmut Schrätze , Karl-Ludwig Weiner : Mineralogy. A textbook on a systematic basis . de Gruyter, Berlin; New York 1981, ISBN 3-11-006823-0 , pp. 168 (as  stibioluzonite ) .

Web links

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

Individual evidence

  1. ↑ a b c d e 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.  79 .
  2. ^ David Barthelmy: Famatinite Mineral Data. In: webmineral.com. Retrieved June 20, 2019 .
  3. ↑ a b c d Famatinite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 (English, handbookofmineralogy.org [PDF; 62  kB ; accessed on June 20, 2019]).
  4. ↑ Localities for Famatinite. In: mindat.org. Hudson Institute of Mineralogy, accessed June 20, 2019 .
  5. ↑ Famatinite. In: mindat.org. Hudson Institute of Mineralogy, accessed June 20, 2019 .