Klockmannite Mineral Data

Klockmannite Mineral Data +

General Klockmannite Information

Chemical Formula:

CuSe

Composition:

Molecular Weight = 142.51 gm

Copper 44.59 % Cu

Selenium 55.41 % Se

______

100.00 %

Empirical Formula:

CuSe

Environment:

Of hydrothermal origin.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

Sierra de Umango, La Rioja province, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for Friedrich Klockmann (1857-1937), German mineralogist of Aachen.

Synonym:

ICSD 82331

PDF 34-171

Klockmannite Image

Images:

Klockmannite

Comments: Klockmannite intergrown with covellite on quartz.
Location: Lichtenberg Mine, Ronneburg U Deposit, Gera district, Thuringia, Germany. Scale: Picture size 7.5 mm.
© Thomas Witzke / Abraxas-Verlag

Klockmannite Crystallography

Axial Ratios:

a:c = 1:4.38039

Cell Dimensions:

a = 3.938, c = 17.25, Z = 6; V = 231.67 Den(Calc)= 6.13

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 2.88(1), 3.18(0.9), 1.967(0.8),

Crystal Structure:

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Berry L G , American Mineralogist , 39 (1954) p.504-509, The crystal structure of covellite, CuS and klockmannite, CuSe

Physical Properties of Klockmannite

Cleavage:

[0001] Perfect

Color:

Blue black, Grayish black, Dark gray.

Density:

5.99

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic - Dull

Optical Properties of Klockmannite

RL Anisotrophism:

Strong, brownish gray to gray-white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Klockmannite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	17.20	43.70
420 nm	17.20	42.80
440 nm	17.20	41.90
460 nm	17.00	41.00
480 nm	16.90	40.00
500 nm	16.60	39.20
520 nm	16.20	38.30
540 nm	15.80	37.40
560 nm	15.10	36.60
580 nm	14.40	35.80
600 nm	13.80	35.00
620 nm	13.60	34.20
640 nm	13.80	33.20
660 nm	14.70	32.40
680 nm	16.20	31.60
700 nm	18.80	30.80

**Calculated Relative Intensity Colors of Klockmannite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	580%
R₁
R₂

Calculated Properties of Klockmannite

Electron Density:

r_electron=5.42 gm/cc
note: r_Klockmannite=6.13 gm/cc.

Fermion Index

Fermion Index = 0.04211
Boson Index = 0.95789

Photoelectric:

PE_Klockmannite= 65.16 barns/electron
U=PE_Klockmannite x r_electron= 353.17 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Klockmannite is Not Radioactive

Klockmannite Classification

Dana Class:

2.8.12.2 (2)Sulfides - Including Selenides and Tellurides

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

(2.8.12)Dana Group

2.8.12.1 Covellite CuS P 6₃/mmc 6/m 2/m 2/m

2.8.12.2 Klockmannite CuSe P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/C.22-20 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.22 - Covellite series

II/C.22-10 Covellite CuS P 6₃/mmc 6/m 2/m 2/m

II/C.22-20 Klockmannite CuSe P 6₃/mmc 6/m 2/m 2/m

II/C.22-30 Idaite Cu5FeS6 P 6₃/mmc 6/m 2/m 2/m

II/C.22-40 Nukundamite (Cu,Fe)4S4 P 3m1 3 2/m

Other Klockmannite Information

References:

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

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Klockmannite

CuSe
Dana No: 2.8.12.2 Strunz No: II/C.22-20
Locality:

Notes: