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.

Name Pronunciation:

Kobellite + Pronunciation

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Miehe G , Nature Physical Science , 231 (1971) p.133-134, Crystal structure of kobellite, Locality: Korunka mine, Spissko-Gemerske Rudohorie Mountains, Czechoslovakia

Physical Properties of Kobellite

Cleavage:

{010} Distinct

Color:

Lead gray, Steel gray.

Density:

6.3

Diaphaneity:

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:

Bulk Density (Electron Density)=5.74 gm/cc
note: Specific Gravity of Kobellite =6.89 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kobellite is Not Radioactive

Kobellite Classification

Dana Class:

03.06.19.01 (03)Sulfides - Sulfosalts

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

(03.06.19)Dana Group

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

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

Strunz Class:

02.HB.10a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.H - Sulfosalts of SnS Archetype

02.HB -With Cu, Ag, Hg, Fe, Sn and Pb

02.HB.10a Kobellite Pb22Cu4(Bi,Sb)30S69 Pnmm 2/m 2/m 2/m

02.HB.10a Tintinaite Pb22Cu4(Sb,Bi)30S69 Pnnm 2/m 2/m 2/m

Other Kobellite Information

References:

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

See Also:

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

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Ask about Kobellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Kobellite

Pb22Cu4(Bi,Sb)30S69
Dana No: 03.06.19.01 Strunz No: 02.HB.10a
Locality:

Notes: