Cutinaite

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Cutinaite
Kutinaite.jpg
Kutinait from Černý Důl , Giant Mountains , Bohemia , Czech Republic
General and classification
other names

IMA 1969-034

chemical formula Cu 14 Ag 6 As 7
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.AA.25 ( 8th edition : II / A.01)
02.02.02.02
Crystallographic Data
Crystal system cubic
Crystal class ; symbol m 3 m
Space group Pm 3 m
Lattice parameters a  = 11.78  Å Please complete the source as an individual reference!
Formula units Z  = 4 Please complete the source as an individual reference!
Physical Properties
Mohs hardness 4.5
Density (g / cm 3 ) 8.39
Cleavage is missing
Break ; Tenacity elastic
colour silvery gray
Line color Please complete!
transparency opaque
shine Metallic luster

Kutinaite is a very rare mineral from the mineral class of sulfides and sulfosalts .

It crystallizes in the cubic crystal system with the chemical formula Cu 14 Ag 6 As 7 and forms small grains that occur as adhesions with Novákite . Kutinaite is silvery-gray in color.

Etymology and history

The mineral was first found in 1970 by J. Hak, Z. Johan and Brian Skinner in the type locality Černý Důl (Schwarzenthal) in the Giant Mountains (Czech Republic). They named the new mineral after the Czech mineralogist Jan Kutina .

classification

In the Strunz system , kutinaite is classified as sulfides and sulfosalts. It is counted among the alloys and alloy-like compounds. In the eighth edition , it formed a group with Algodonit , Cuprostibit , Domeykit , Koutekit and Novákit. In the ninth edition , the alloys are also subdivided according to cations, where Kutinaite can be found in the class of semi-metals with copper (Cu), silver (Ag) or gold (Au).

In the systematics of minerals according to Dana it forms with minerals domeykite and dienerite a subgroup of sulfides - including selenides and tellurides - with the composition Am Bn Xp, with (m + n): p = 3: 1.

Crystal structure

Kutinaite crystallizes in the cubic crystal system in the space group with the lattice parameter a = 11.78  Å and four formula units per unit cell .

properties

Unlike many other minerals, kutinaite is malleable. The mineral can be etched with nitric acid and iron (III) chloride solution .

Education and Locations

Kutinaite formed in hydrothermal veins rich in carbonate . It is associated with Novákit, Koutekit, Paxit , Arsenolamprit , Löllingit , Allargentum , Domeykit , Lautit , Arsenic , Silver or Proustite , depending on where it was found .

Only a few sites are known. In addition to the type locality in the Giant Mountains, these are Lodève in France , Nieder-Beerbach in Hesse ( Germany ) and Anarak in the Esfahan province ( Iran ).

See also

Individual evidence

  1. ^ List of minerals according to Dana at webmineral.com
  2. ↑ J. Hak, Z. Johan and Brian J. Skinner: Kutinaite; a new copper-silver arsenide mineral from Cerny Dul, Czechoslovakia . In: American Mineralogist, 1970, 55, pp. 1083-87, pdf .
  3. ↑ MinDat - Localities for Kutinaite (Eng.)

literature

  • Kutinait in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf )

Web links