Krennerite Mineral Data

Krennerite Mineral Data +

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General Krennerite Information

Chemical Formula:

AuTe2

Composition:

Molecular Weight = 452.17 gm

Tellurium 56.44 % Te

Gold 43.56 % Au

______

100.00 %

Empirical Formula:

AuTe₂

Environment:

Found in hydrothermal veins with other tellurides.

IMA Status:

Valid Species (Pre-IMA) 1877

Locality:

Sacarâmb (Nagyág, Szekerembe), Transylvania, Romania. Link to MinDat.org Location Data.

Name Origin:

Named for Joseph A. Krenner (1839-1920), Hungarian mineralogist.

Synonym:

ICSD 30902

PDF 20-Aug

Krennerite Image

Images:

Krennerite

Comments: Metallic krennerite crystals on quartz.
Location: Emperor mine, Vatukoula, Viti Levu, Fiji. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Krennerite Crystallography

Axial Ratios:

a:b:c =1.8752:1:0.5056

Cell Dimensions:

a = 16.54, b = 8.82, c = 4.46, Z = 8; V = 650.64 Den(Calc)= 9.23

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pma2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.03(1), 2.11(0.7), 2.94(0.6),

Forms:

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Crystal Structure:

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Tunell G , Murata K J , American Mineralogist , 35 (1950) p.959-984, The atomic arrangement and chemical composition of krennerite

View Additional jPOWD Structure files for Krennerite
[1]

Physical Properties of Krennerite

Cleavage:

[???] Perfect

Color:

White, Blackish yellow.

Density:

8.53

Diaphaniety:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Metallic

Streak:

greenish gray

Optical Properties of Krennerite

RL Anisotrophism:

Strong, to dark brown.

RL Color:

Creamy white.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Krennerite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	47.40	52.30
420 nm	50.20	54.70
440 nm	53.00	57.10
460 nm	55.50	59.00
480 nm	57.50	60.40
500 nm	58.80	61.30
520 nm	59.80	62.00
540 nm	60.40	62.40
560 nm	60.90	62.80
580 nm	61.10	63.00
600 nm	61.50	63.40
620 nm	62.00	63.90
640 nm	62.30	64.40
660 nm	62.60	64.80
680 nm	62.80	65.20
700 nm	62.80	65.50

**Calculated Relative Intensity Colors of Krennerite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	170%
R₁
R₂

Calculated Properties of Krennerite

Electron Density:

r_electron=7.47 gm/cc
note: r_Krennerite=9.23 gm/cc.

Fermion Index

Fermion Index = 0.04509
Boson Index = 0.95491

Photoelectric:

PE_Krennerite= 945.97 barns/electron
U=PE_Krennerite x r_electron=7,067.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Krennerite is Not Radioactive

Krennerite Classification

Dana Class:

2.12.13.1 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.13)Dana Group

2.12.13.1 Krennerite AuTe2 Pma2 mm2

2.12.13.2 Calaverite AuTe2 C 2/m 2/m

2.12.13.3 Sylvanite (Au,Ag)2Te4 P 2/c 2/m

2.12.13.4 Kostovite CuAuTe4 Pma2 mm2

Strunz Class:

II/D.16-30 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.16 - Kostovite - Calaverite series

II/D.16-10 Kostovite CuAuTe4 Pma2 mm2

II/D.16-20 Sylvanite (Au,Ag)2Te4 P 2/c 2/m

II/D.16-30 Krennerite AuTe2 Pma2 mm2

II/D.16-40 Calaverite AuTe2 C 2/m 2/m

Other Krennerite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Krennerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - HyperPhysics
10 - MinDAT
11 - MinMax(Deutsch)
12 - MinMax(English)
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Krennerite

AuTe2
Dana No: 2.12.13.1 Strunz No: II/D.16-30
Locality:

Notes: