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Eckerite

A valid IMA mineral species
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Discuss Eckerite
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EditAdd SynonymEdit CIF structuresClear Cache
Ag2CuAsS3
Colour:
Reddish-brown
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
5.313 (Calculated)
Crystal System:
Monoclinic
Name:
Named for Markus Ecker (b. 1966), mining engineer and mineral collector from Schiffweiler, Germany. He is an expert on the minerals from Lengenbach, Tsumeb and the Kalahari manganese field. He has discovered four new minerals. He is a Member of the Technical Commission of the Forschungsgemeinschaft Lengenbach (FGL, Lengenbach Research Association) and has published many articles on the locality.
Type Locality:
ⓘLengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland
Isostructural with:
Xanthoconite
The crystal structure is topologically identical to that ofxanthoconite andpyrostilpnite, with one of the three independent Ag positions dominated by Cu.

Compare the chemically similarkeutschite.

In thin plates, transparent; in thick sections, opaque.


Unique Identifiers
Approval year:
2014
First published:
2015
Type description reference:
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 (3) 687-694doi:10.1180/minmag.2015.079.3.13

Classification of Eckerite

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S

Mineral Symbols
Transparency:
Transparent, Opaque
Colour:
Reddish-brown
Streak:
Dark orange-red
Hardness:
2½ - 3 onMohs scale
Hardness:
VHN100=64 - 78 - Vickers
Comment:
~2½–3
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
5.313 g/cm3 (Calculated)
Comment:
Could not be measured due to small grain size.

Optical Data of Eckerite

Crystallography 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.
Associated Minerals at Type Locality:
HatchiteRealgarSinneriteSmithiteTrechmannite
Reference:
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 (3) 687-694doi:10.1180/minmag.2015.079.3.13

Synonyms of Eckerite

Other Language Names for Eckerite

Related Minerals -Strunz-mindat GroupingMon. 2/m2.GA.ArsiccioiteAgHg2Tl(As,Sb)2S6Tet.42m :I42m2.GA.05ProustiteAg3AsS3Trig.3m(32/m) :R3c2.GA.05PyrargyriteAg3SbS3Trig. 3m :R3c2.GA.10XanthoconiteAg3AsS3Mon. 2/m :B2/b2.GA.10PyrostilpniteAg3SbS3Mon. 2/m :P21/b2.GA.15SamsoniteAg4MnSb2S6Mon. 2/m :P21/m2.GA.20BytíziteCu3SbSe3Orth.mmm(2/m2/m2/m) :Pnma2.GA.20SkinneriteCu3SbS3Mon. 2/m :P21/b2.GA.20WitticheniteCu3BiS3Orth. 222 :P2121212.GA.25LapieiteNiCuSbS3Orth. 222 :P2121212.GA.25LisiguangitePtCuBiS3Orth. 222 :P2121212.GA.25MalyshevitePdCuBiS3Orth.mmm(2/m2/m2/m) :Pmmm2.GA.25RoterbäritePdBiCuSe3Orth. 222 :P2121212.GA.25MückeiteNiCu(Bi,Sb)S3Orth. 222 :P2121212.GA.30AktashiteCu6Hg3As4S12Trig. 3 :R32.GA.30NowackiiteCu6Zn3As4S12Trig. 3 :R32.GA.30ZhengminghuaiteCu6Fe3As4S12Trig. 3 :R32.GA.30GruzdeviteCu6Hg3Sb4S12Trig. 3 :R32.GA.35LaffittiteAgHgAsS3Mon. 2/m2.GA.40Unnamed (Ag-Fe endmember of Routhierite Group)AgFe2TlAs2S62.GA.40RouthieriteTl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6Tet.42m :I42m2.GA.40StalderiteTl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6Tet.42m :I42m2.GA.40RalphcannoniteAgZn2TlAs2S6Tet.42m :I42m2.GA.40FerrostalderiteCuFe2TlAs2S6Tet.42m :I42m2.GA.45ErniggliiteTl2SnAs2S6Trig.3 :P32.GA.50CerromojoniteCuPbBiSe3Orth.2.GA.50SeligmannitePbCuAsS3Orth.mmm(2/m2/m2/m) :Pmmn2.GA.50SoučekitePbCuBi(S,Se)3Orth.mm22.GA.50Unnamed (Pb-Cu-Bi Selenide)PbCuBiSe32.GA.50BournonitePbCuSbS3Orth.mm2 :Pmn212.GA.55EldragóniteCu6BiSe4(Se2)Orth.mmm(2/m2/m2/m)

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    • References for EckeriteⓘGlasberg quarryBelendorff (2021)
    Switzerland (TL)
     
    Williams et al. (2015)+2 other references
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