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Eckerite

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Formula:
Ag2CuAsS3
System:
Monoclinic
Colour:
Reddish-brown
Lustre:
Metallic
Hardness:
2½ - 3
Name:
Named for Markus Ecker, a well known expert on the minerals from Lengenbach.
Isostructural with:
The crystal structure is topologically identical to that of xanthoconite and pyrostilpnite, with one of the three independent Ag positions dominated by Cu.

Compare the chemically similar keutschite.


Classification of Eckerite

Approved
Approval Year:
2014

Physical Properties of Eckerite

Metallic
Colour:
Reddish-brown
Streak:
Dark orange-red
Hardness (Mohs):
2½ - 3
Hardness (Vickers):
VHN100=64 - 78
Comment:
~2½–3
Tenacity:
Brittle

Chemical Properties of Eckerite

Formula:
Ag2CuAsS3
Elements listed in formula:
Analytical Data:
Mean of five electron microprobe analyses
Ag (52.08)(16)
Cu (11.18)(9)
Pb (0.04)(1)
Sb (0.29)(3)
As (15.28)(11)
S (20.73)(13)
total 99.60 wt.%

Crystallography of Eckerite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Space Group Setting:
C2/c
Cell Parameters:
a = 11.8643(3) Å, b = 6.2338(1) Å, c = 16.6785(4) Å
β = 110.842(3)°
Ratio:
a:b:c = 1.903 : 1 : 2.675
Unit Cell Volume:
V 1152.81 ų
Z:
8
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.446(70)
3.246(50)
2.941(100)
2.776(40)
2.134(50)
2.084(18)
2.076(40)
1.738(40)
Comments:
From Type Description.

Type Occurrence of Eckerite

General Appearance of Type Material:
Euhedral crystals up to 300 μm across
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museo di Storia Naturale, Universita` di Firenze, Via La Pira 4, I-50121 Firenze, Italy, catalogue number 3144/I
Empirical Formula:
Ag2.24Cu0.82As0.94Sb0.01S2.99
Associated Minerals at Type Locality:

Other Names for Eckerite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Eckerite

Reference List:
Bindi, L., Nestola, F., Graeser, S., Tropper, P. and Raber, T. (2015) Eckerite, IMA 2014-063. CNMNC Newsletter No. 23, February 2015, page 52; Mineralogical Magazine, 79, 51-58.

Bindi, L., Nestola, F., Graeser, S., Tropper, P., Raber, T. (2015): Eckerite, Ag2CuAsS3, a new Cu-bearing sulfosalt from Lengenbach quarry, Binn valley, Switzerland: description and crystal structure. Mineralogical Magazine, 79, 687-694.

Internet Links for Eckerite

mindat.org URL:
https://www.mindat.org/min-46496.html
Please feel free to link to this page.

Localities for Eckerite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Fäld (Imfeld; Im Feld; Feld)
Bindi, L., Nestola, F., Graeser, S., Tropper, P. and Raber, T. (2015) Eckerite, IMA 2014-063. CNMNC Newsletter No. 23, February 2015, page 52; Mineralogical Magazine, 79, 51-58.; Bindi, L., Nestola, F., Graeser, S., Tropper, P., Raber, T. (2015): Eckerite, Ag2CuAsS3, a new Cu-bearing sulfosalt from Lengenbach quarry, Binn valley, Switzerland: description and crystal structure. Mineralogical Magazine, 79, 687-694.
Mineral and/or Locality  
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