Petrukite

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Petrukite
General and classification
other names

IMA 1985-052

chemical formula (Cu, Ag) 2 (Fe, Zn) (Sn, In) S 4
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.KA.05 ( 8th edition : II / C.06)
02.09.18.01
Crystallographic Data
Crystal system orthorhombic
Crystal class ; symbol orthorhombic-pyramidal; mm 2
Room group (no.) Pnm 2 1 (No. 31)
Lattice parameters a  = 6.45  Å ; b  = 7.70 Å; c  = 6.28 Å
Formula units Z  = 2
Physical Properties
Mohs hardness not defined, Microhardness VHN 100 319
Density (g / cm 3 ) Please complete!
Cleavage clearly after {ll0}, {100} and {010}
colour brown, greenish brown to gray
Line color Please complete!
transparency Please complete!
shine Please complete!

Petrukite is a very rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the orthorhombic crystal system with the chemical composition (Cu, Ag) 2 (Fe, Zn) (Sn, In) S 4 . The elements indicated in the round brackets can represent each other in the formula ( substitution , diadochie), but are always in the same proportion to the other components of the mineral.

So far, Petruki could only be found in the form of small, rounded grains with a diameter of 240 to 400 μm inside massive galena or sphalerite aggregates. In incident light, petrukite appears brown in the air, but greenish-brown in oil. As the zinc content increases, the color becomes grayer.

Etymology and history

Petrukite was first described in 1989 by Stephen Kissin and D'Alton Owens, who named the mineral after the Canadian mineralogist William Petruk (* 1930), who noted its possible existence in his 1973 study of Mount Pleasant ores.

Petrukite was first discovered at three different sites, which are considered to be the type locality for this mineral: in the "Ikuno Mine" near Asago in the Japanese prefecture of Hyōgo and in the Herb mine field, which is located on the Turnagain River in the catchment area of ​​the Liard River , and in the "Mount Pleasant Mine" near Fredericton in Charlotte County in Canada (British Columbia).

classification

In the now outdated, but still in use 8th edition of the mineral classification according to Strunz , the petrukite belonged to the mineral class of "sulfides and sulfosalts" and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 he together with Barquillit , Briartit , Černýit ( Cernyit ) Famatinit , Ferrokësterit ( Ferrokesterit ) Hocartit , kesterite ( kesterite ) Kuramit , Luzonit , Permingeatit , Pirquitasit , Rhodostannit , Sakuraiit , stannite , Toyohait and Velikit the "Stannit group" with the system no. II / C.06 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), assigns the petrukite to the new division of “Sulfarsenate” and the unnamed subdivision “KA”, where it is only combined with Enargit the "Enargit group" with the system no. 2.KA.05 forms.

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the petrukite to the class of "sulfides and sulfosalts" and there in the department of "sulfide minerals". Here he is the only member of the unnamed group 02.09.18 within the subdivision of " Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 1: 1 " .

Education and Locations

Petrukite is found in polymetallic veins within granitic plutons . In addition to galena and sphalerite, arsenopyrite , chalcopyrite , cassiterite , potosite , pyrite , quartz and sakuraiite appear as accompanying minerals .

So far, petruktite has been found at fewer than ten sites worldwide. In addition to the aforementioned type localities in Japan (Ikuno Mine) and Canada (Herb Grubenfeld, Mount Pleasant Mine), these are also the “Oploca Mine” in the Mina Pirquitas deposit in the Argentine department of Rinconada , Agios Konstantinos ( Kamariza ) and the “Jean Baptiste Mine” “In the Greek municipality of Lavrio and the municipality of Gemerská Poloma in eastern Slovakia.


Crystal structure

Petrukite crystallizes orthorhombically in the space group Pnm 2 1 (space group no. 31) with the lattice parameters a  = 6.45  Å ; b  = 7.70 Å and c  = 6.28 Å and 2 formula units per unit cell .

See also

literature

  • Stephen Kissin, D'Alton Owens: The relatives of stannite in the light of new data. In: Canadian Mineralogist. Vol. 27, 1989, ISSN  0008-4476 , pp. 673-688, ( PDF 2.74 MB ).

Web links

Individual evidence

  1. ↑ 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.  82 .
  2. ↑ Webmineral - Petrukite
  3. ↑ a b Kissin, Owens: The relatives of stannite in the light of new data , p. 673 (PDF p. 1)
  4. ↑ a b John L. Jambor, Ernst AJ Burke: New Mineral Names , in: American Mineralogist , Volume 75 (1990), p. 1432 ( PDF 824.2 kB ; p. 2)
  5. ↑ a b Kissin, Owens: The relatives of stannite in the light of new data , p. 674 (PDF p. 2)
  6. ^ Kissin, Owens: The relatives of stannite in the light of new data , p. 676 (PDF p. 4)
  7. ↑ Mindat - Number of localities for Petrukit
  8. ^ Mindat - Petrukite