Putzit

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Putzit
General and classification
other names

IMA 2002-024

chemical formula (Cu, Ag) 8 GeS 6
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.BA.35 ( 8th edition : II / B.08)
05/02/10/01
Crystallographic Data
Crystal system cubic
Crystal class ; symbol cubic-hexakistrahedral; 4  3  m
Space group F 4 3 m (No. 216)Template: room group / 216
Lattice parameters a  = 10,201  Å
Formula units Z  = 4
Physical Properties
Mohs hardness 3 to 3.5
Density (g / cm 3 ) calculated: 5.788
Cleavage clear
Break ; Tenacity irregular to scalloped, brittle
colour iron black
Line color black
transparency opaque
shine Metallic luster

Putzite is a very rarely occurring mineral from the mineral class of " sulfides and sulfosalts ". It crystallizes in the cubic crystal system with the chemical composition (Cu, Ag) 8 GeS 6 , more precisely (Cu 4.7 Ag 3.3 ) Σ 8 GeS 6 and has so far only been in the form of opaque, iron-black and metallically shiny crystal grains of a few millimeters Size found.

Etymology and history

Hubert Putz (* 1973) discovered in 2002 during his research on the mineralogy of the germanium of the Capillitas deposits in an old mine near the Rosario vein (Capillitas mine district) in the Department of Andalgalá (Argentina) an apparently previously unknown mineral. In the same year, samples of this mineral were analyzed by a research team consisting of Andrew C. Roberts, Peter Berlepsch, Thomas Armbruster, Dan Topa and Georg Zagler under the direction of Werner H. Paar ( University of Salzburg ) and the results of the International Mineralogical Association ( IMA) submitted for review. This confirmed the result and recognized the mineral under the provisional designation "IMA 2002-024" as independent. The research result and the also recognized name were published in 2004 in "The Canadian Mineralogist".

The mineral name was chosen by the research team in honor of its discoverer Hubert Putz, who also did a great job researching the mineralogy of the germanium of the Capillitas deposits.

classification

Already in the outdated, but still in use 8th edition of the mineral classification according to Strunz , the putzite belonged to the mineral class of "sulfides and sulfosalts" and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 Argyrodit and Canfieldit he formed the unnamed group II / B.08 .

The 9th edition of Strunz's mineral systematics, which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), is also included in the section on "Metal sulfides, M: S> 1: 1 (mainly 2: 1)". However, this is further subdivided according to the predominant metals in the compound, so that the mineral can be found according to its composition in the sub-section "with copper (Cu), silver (Ag), gold (Au)", where it is also found together with argyrodite and Canfieldit forms the unnamed group 2.BA.35 .

The systematics of minerals according to Dana , which is mainly used in the English-speaking area , assigns putzite to the class of "sulfides and sulfosalts" and there into the category of "sulfide minerals". Here he is together with Calvertit ( IMA 2006-030 ) in the unnamed group 02.05.10 within the subdivision “Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 3 : 2 “to be found.

Crystal structure

Putzit crystallizes cubically in the space group F 4 3 m (space group no. 216) with the lattice parameter a  = 10,201  Å and 4 formula units per unit cell . Template: room group / 216

Education and Locations

Putzit is found embedded in a matrix of chalcosine with residues of bornite in vent breccias and veins of andesitic-rhyolitic volcanic rocks .

So far (status: 2010) the mineral could only be detected at its type locality , the "Capillitas Mine" in Argentina.

See also

literature

  • Werner H. Paar, Andrew C. Roberts, Peter Berlepsch, Thomas Armbruster, Dan Topa, Georg Zagler: Putzite, a new mineral species from Capillitas, Catamarca, Argentina: Description and crystal structure . In: The Canadian Mineralogist . tape 42 , 2004, p. 1757–1769 ( rruff.info [PDF; 1,2 MB ; accessed on April 20, 2017]).

Web links

Individual evidence

  1. ↑ Webmineral - Putzite (English)
  2. ↑ a b c d e f Werner H. Paar, Andrew C. Roberts, Peter Berlepsch, Thomas Armbruster, Dan Topa, Georg Zagler: Putzite, a new mineral species from Capillitas, Catamarca, Argentina: Description and crystal structure . In: The Canadian Mineralogist . tape 42 , 2004, p. 1757–1769 ( rruff.info [PDF; 1,2 MB ; accessed on April 20, 2017]).
  3. ↑ IMA / CNMNC List of Mineral Names - Putzite (English, PDF 1.66 MB; p. 152)
  4. ↑ Find location list for Putzit in the Mineralienatlas and Mindat