Mushistonite

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Mushistonite
Kesterite, Mushistonite-236726.jpg
Mushistonite-coated kësterite on mica from Mount Xuebaoding, Pingwu , Sichuan, China ( total size of the sample: 60 mm × 45 mm)
General and classification
other names

IMA 1982-068

chemical formula
  • Cu 2+ Sn 4+ (OH) 6
  • (Cu, Zn, Fe) Sn (OH) 6
Mineral class
(and possibly department) 		Oxides and hydroxides
System no. to Strunz
and to Dana 		4.FC.10 ( 8th edition : IV / F.16)
03/06/06/06
Crystallographic Data
Crystal system cubic
Crystal class ; symbol cubic hexakisoctahedral; 4 / m 3 2 / m
Room group (no.) Pn 3 m (No. 224)
Lattice parameters a  = 7.73  Å
Formula units Z  = 4
Physical Properties
Mohs hardness 4 to 4.5
Density (g / cm 3 ) not defined
Cleavage not defined
Break ; Tenacity not defined
colour brownish green to malachite green, yellowish green to yellow brown
Line color not defined
transparency translucent
shine Glass gloss

Mushistonite (Russian Мушистонит ) is a very rare mineral from the mineral class of " oxides and hydroxides ". It crystallizes in the cubic crystal system with the idealized composition Cu 2+ Sn 4+ (OH) 6 , so from a chemical point of view it is a copper - tin hydroxide. Since, usually a low content of copper in through Mushistonitproben, which were used for analysis of the composition of zinc and / or iron replaced , the formula is often also with (Cu, Zn, Fe) Sn (OH) 6 indicated.

So far, mushistonite could only be found in the form of fine-grain, earthy aggregates and crusty coatings of brownish-green to malachite-green or yellowish-green to yellow-brown color.

Special properties

Mushistonite is easily soluble in dilute hydrochloric acid.

Etymology and history

Mushistonite was first discovered in the "Mushiston" deposit about 35 km south of Pendzhikent in the Zeravshan Mountain Range ( Sughd Province ) in Tajikistan and described in 1984 by NK Marshukova, AB Pavlovskii, GA Sidorenko, who named the mineral after its type locality .

classification

In the meantime outdated, but still in use 8th edition of the mineral classification by Strunz of Mushistonit to the department belonged "hydroxides and oxide hydrates (hydrous oxides with layered structure)" where he collaborated with Burtit , Natanit , Schoenfliesit , Vismirnovit and Wickmanit the "Schoenfliesit -Group "with the system no. IV / F.16 .

The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), classifies the mushistonite in the newly defined division of "hydroxides (without V or U)". This is further subdivided according to the possible presence of OH and / or H 2 O as well as the crystal structure, so that the mineral is classified according to its composition and structure in the sub-section “Hydroxides with OH, without H 2 O; corner-linked octahedra "is to be found, where the" Schoenfliesite group "with the system number is also found together with burtite, natanite, schoenfliesite, vismirnovite and wickmanite. 4.FC.10 forms.

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the mushistonite to the class of "oxides and hydroxides" and there in the department of "hydroxides and hydroxide-containing oxides". Here it is together with Wickmanite, Schoenfliesite, Natanite, Vismirnovit and Burtit in the " Wickmanite group (cubic or trigonal, with 2+ cations and Sn) " with the system no. 06.03.06 within the sub-section "Hydroxides and hydroxides containing oxides with (OH) 3 or (OH) 6 groups".

Education and Locations

Kësterite , completely encrusted with mushistonite Mount Xuebaoding, Pingwu , Sichuan, China (size: 1.4 × 1.3 × 1.3 cm)

Mushistonite is secondary to the weathering of stannite in the oxidation zone of tin deposits. In addition to stannite, chalcopyrite , galena , cassiterite , pseudomalachite , quartz and sphalerite can also occur as accompanying minerals .

So far (as of 2013) only a few samples of mushistonite have been found in fewer than 10 locations. Its type locality "Mushiston" is the only known site in Tajikistan to date.

Other previously known sites are the "Huya" deposit on Mount Xuebaoding in Pingwu County in China, Carrara in the Apuan Alps in the Italian province of Massa-Carrara, the Kësterite deposit in the Arga-Ynnakh-Khai granite massif of the Jana Valley in Russia Sakha Republic ( Yakutia ) and the "Etta" and "Peerless" mines near Keystone in Pennington County (South Dakota) in the United States of America.

Crystal structure

Mushistonite crystallizes cubically in the space group Pn 3 m (space group no. 224) with the lattice parameter a  = 7.73  Å and 4 formula units per unit cell .

See also

literature

  • NK Marshukova, AB Pavlovskii, GA Sidorenko: Mushistonite, (Cu, Zn, Fe) Sn (OH) 6 , a new tin mineral , In: Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva , Volume 113 (1984), Chapter 5, pp. 612-617 ( PDF 877.2 kB in Russian)
  • Mushistonite , In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America , 2001 ( PDF 68.9 kB )

Web links

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

Individual evidence

  1. ↑ a b IMA / CNMNC List of Mineral Names; February 2013 (PDF 1.3 MB)
  2. ↑ a b c d e 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.  232 .
  3. ↑ Webmineral - Mushistonite
  4. ^ PJ Dunn, JA Ferraiolo, M. Fleischer, V. Gobel, JD Grice, RH Langley, JE Shigley, DA Vanko, JA Zilczer: New mineral names , In: American Mineralogist , Volume 70 (1985), pp. 1329-1335 ( PDF 713.6 kB ; p. 3)
  5. ↑ List of locations for mushistonite in the Mineralienatlas and Mindat