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Krennerite

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Cresson Mine, Eclipse Gulch, Cripple Creek District, Teller Co., Colorado, USA
© Brent Thorne 2008

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Formula:
(Au,Ag)Te
 
2
System:OrthorhombicColour:Silver white
Hardness:2 - 3
Name:
In honor of the Hungarian mineralogist, Joseph A. Krenner (1839-1920).
This page provides mineralogical data about Krennerite.

Classification of Krennerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.16-30
Nickel-Strunz 10th (pending) edition ID:2.EA.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
A : M:S = 1:2 - With Cu, Ag, Au
Dana 8th edition ID:2.12.13.1

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.:3.3.2

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
3 : Sulphides etc. of Au
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Type Occurrence of Krennerite

Type Locality:Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Hunedoara Co., Romania
Year of Discovery:1877

Occurrences of Krennerite

Geological Setting:Hydrothermal veins with tellurium.

Physical Properties of Krennerite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Silver white
Hardness (Mohs):2 - 3
Hardness (Vickers):VHN100=166 - 186 kg/mm2
Cleavage:Perfect
on {001}
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):8.62 g/cm3
Density (calculated):8.86 g/cm3

Crystallography of Krennerite

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pma2
Cell Parameters:a = 16.58Å, b = 8.849Å, c = 4.464Å
Ratio:a:b:c = 1.874 : 1 : 0.504
Unit Cell Volume:V 654.94 ų (Calculated from Unit Cell)
Z:8
Morphology:Crystals striated, short prismatic.
Crystal Atlas:
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Krennerite - Short prismatic [001]

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The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. You need Java to see these. You can download Java for free - click here to download Java

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Optical Data of Krennerite

Type:Anisotropic
Anisotropism:Strong to dark brown
Colour in reflected light:Creamy white
Pleochroism:Weak

Chemical Properties of Krennerite

Formula:
(Au,Ag)Te
 
2
Essential elements:Au, Te
All elements listed in formula:Ag, Au, Te
Common Impurities:Fe

Relationship of Krennerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.EA.05Sylvanite
(Au,Ag)
 
2
Te
 
4
2.EA.10Calaverite
AuTe
 
2
2.EA.15Kostovite
CuAuTe
 
4
2.EA.20Berndtite
SnS
 
2
2.EA.20Kitkaite
NiTeSe
2.EA.20Melonite
NiTe
 
2
2.EA.20Merenskyite
(Pd,Pt)(Te,Bi)
 
2
2.EA.20Moncheite
(Pt,Pd)(Te,Bi)
 
2
2.EA.20Shuangfengite
IrTe
 
2
2.EA.20Sudovikovite
PtSe
 
2
2.EA.25Verbeekite
PdSe
 
2
2.EA.30Drysdallite
Mo(Se,S)
 
2
2.EA.30Jordisite
MoS
 
2
2.EA.30Molybdenite
MoS
 
2
2.EA.30Tungstenite
WS
 
2
Related Minerals - Hey's Index Grouping:

- +
3.3.1Calaverite
AuTe
 
2
3.3.3Kostovite
CuAuTe
 
4
3.3.4Uytenbogaardtite
Ag
 
3
AuS
 
2
3.3.5Fischesserite
Ag
 
3
AuSe
 
2
3.3.6Petrovskaite
AuAg(S,Se)
3.3.7Petzite
Ag
 
3
AuTe
 
2
3.3.8Muthmannite
AuAgTe
 
2
3.3.9Sylvanite
(Au,Ag)
 
2
Te
 
4
3.3.10Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
3.3.11Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
3.3.12Bilibinskite
PbCuAu
 
3
Te
 
2
3.3.13Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
3.3.14Montbrayite
(Au,Sb)
 
2
Te
 
3

Other Names for Krennerite

Synonyms:
Müllerine
Other Languages:
German:Krennerit
Bunsenin
Gelberz
Müllerin
Weißerz
Weißtellur
Russian:Креннерит
Spanish:Krennerita

Other Information

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

References for Krennerite

Reference List:Klaproth, M.H. (1802): Chemische Untersuchung der siebenbürgischen Golderze, C. Gelberz, Beiträge zur chemischen Kenntniss der Mineralkörper, Dritter Band, Rottmann Berlin, 20-25

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 333-334.

Tschermaks Mineralogische und Petrographische Mitteilungen (1984): 33: 253-262.

Internet Links for Krennerite

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    Localities for Krennerite

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