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Eckerite

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Formula:
Ag2CuAsS3
Colour:
Reddish-brown
Lustre:
Metallic
Hardness:
2½ - 3
Crystal System:
Monoclinic
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.


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Classification of EckeriteHide

Approved
Approval Year:
2014

Physical Properties of EckeriteHide

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

Chemical Properties of EckeriteHide

Formula:
Ag2CuAsS3

Crystallography of EckeriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
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 V:
1152.81 ų
Z:
8

X-Ray Powder DiffractionHide

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 EckeriteHide

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
Associated Minerals at Type Locality:

Synonyms of EckeriteHide

Other Language Names for EckeriteHide

Other InformationHide

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 EckeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 EckeriteHide

Localities for EckeriteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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; Raber, T. and Graeser, S. (2017): Eckerit - ein spezielles Silber-Kupfer-Sulfosalz vom Lengenbach. Schweizer Strahler, 51 (3), 36-37 (in German and French).
Mineral and/or Locality  
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