Kobellite Mineral Data

Kobellite Mineral Data +

General Kobellite Information

Chemical Formula:

Pb22Cu4(Bi,Sb)30S69

Composition:

Molecular Weight = 12858.40 gm

Copper 1.98 % Cu

Bismuth 40.63 % Bi

Antimony 4.73 % Sb

Lead 35.45 % Pb

Sulfur 17.21 % S

______

100.00 %

Empirical Formula:

Pb₂₂Cu₄Bi₂₅Sb₅S₆₉

Environment:

High temperature hydrothermal mineral.

IMA Status:

Valid Species (Pre-IMA) 1839

Locality:

Hvena, Sweden; Ouray, Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Wolfgang Franz von Kobell (1803-1882), German mineralogist.

Synonym:

ICSD 23595

PDF 8-122

Kobellite Image

Images:

Kobellite

Comments: Dark gray metallic crystalline kobellite with quartz.
Location: Crabtree Quarry, Raleigh, Wake County, North Carolina, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Kobellite Crystallography

Axial Ratios:

a:b:c =0.6637:1:0.1179

Cell Dimensions:

a = 22.62, b = 34.08, c = 4.02, Z = 1; V = 3,098.98 Den(Calc)= 6.89

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnmm

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

By Intensity(I/I_o): 3.54(1), 3.41(0.9), 2.72(0.5),

Physical Properties of Kobellite

Cleavage:

[010] Distinct

Color:

Lead gray, Steel gray.

Density:

6.3

Diaphaniety:

Opaque

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Metallic

Magnetism:

Nonmagnetic

Streak:

black

Optical Properties of Kobellite

RL Anisotrophism:

Distinct.

RL Color:

White.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Kobellite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	43.40	50.60
420 nm	44.30	50.30
440 nm	45.20	50.00
460 nm	45.10	49.50
480 nm	44.40	48.80
500 nm	43.60	48.00
520 nm	42.70	47.20
540 nm	41.90	46.40
560 nm	41.20	45.70
580 nm	40.60	45.00
600 nm	40.00	44.40
620 nm	39.60	44.00
640 nm	39.40	43.50
660 nm	39.20	43.10
680 nm	39.00	43.00
700 nm	39.00	42.80

**Calculated Relative Intensity Colors of Kobellite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	220%
R₁
R₂

Calculated Properties of Kobellite

Electron Density:

r_electron=5.74 gm/cc
note: r_Kobellite=6.89 gm/cc.

Fermion Index

Fermion Index = 0.07963
Boson Index = 0.92037

Photoelectric:

PE_Kobellite=1,457.46 barns/electron
U=PE_Kobellite x r_electron=8,362.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kobellite is Not Radioactive

Kobellite Classification

Dana Class:

3.6.19.1 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.19)Dana Group

3.6.19.1 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

3.6.19.2 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

Strunz Class:

II/E.33-20 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x) Lead-Sulfosalts (Pb-Cu/Ag) with predominant Vismut x = 6.0 - 1.6

II/E.33 - Izoklakeite - Berryite series

II/E.33-05 Izoklakeite Pb27(Cu,Fe)2(Sb,Bi)19S57 Pnnm 2/m 2/m 2/m

II/E.33-10 Giessenite Pb13(Cu,Ag)(Bi,Sb)9S28(?) P 2₁/n 2/m

II/E.33-15 Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

II/E.33-20 Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

II/E.33-30 Eclarite Pb9(Cu,Fe)Bi12S28 P nma 2/m 2/m 2/m

II/E.33-40 Nuffieldite Pb2Cu(Pb,Bi)Bi2S7 Pbnm 2/m 2/m 2/m

II/E.33-50 Berryite Pb3(Ag,Cu)5Bi7S16 P 2₁/m 2/m

Other Kobellite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Print or Cut-and-Paste your Kobellite Specimen Label here :

Kobellite

Pb22Cu4(Bi,Sb)30S69
Dana No: 3.6.19.1 Strunz No: II/E.33-20
Locality:

Notes: