Izoklakeite Mineral Data

Izoklakeite Mineral Data +

General Izoklakeite Information

Chemical Formula:

Pb27(Cu,Fe)2(Sb,Bi)19S57

Composition:

Molecular Weight = 10557.27 gm

Iron 0.21 % Fe

Copper 0.96 % Cu

Bismuth 15.84 % Bi

Antimony 12.69 % Sb

Lead 52.99 % Pb

Sulfur 17.31 % S

______

100.00 %

Empirical Formula:

Pb₂₇Cu_1.6Fe²⁺_0.4Sb₁₁Bi₈S₅₇

Environment:

In a massive Zn-Cu-Pb sulfide deposit.

IMA Status:

Approved IMA 1986

Locality:

From Izok Lake, Northwest Territories, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 202309

IMA1983-065

PDF 41-592

Izoklakeite Image

Images:

Izoklakeite

Comments: Prismatic metallic gray microcrystal of izoklakeite (mounted on paper).
Location: Vena Mine, Bergslagen, Orebro, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Izoklakeite Crystallography

Axial Ratios:

a:b:c =0.897:1:0.1072

Cell Dimensions:

a = 34.07, b = 37.98, c = 4.072, Z = 2; V = 5,269.08 Den(Calc)= 6.65

Crystal System:

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

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

By Intensity(I/I_o): 3.427(1), 3.042(0.8), 3.312(0.8),

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
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Armbruster T , Hummel W , American Mineralogist , 72 (1987) p.821-831, (Sb,Bi,Pb) ordering in sulfosalts: Crystal-structure refinement of a Bi-rich, izoklakeite

Physical Properties of Izoklakeite

Cleavage:

[001] Good

Color:

Lead gray.

Density:

6.47

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Streak:

grayish black

Optical Properties of Izoklakeite

RL Anisotrophism:

Distinct, from greenish gray to dark gray to brownish gray.

RL Pleochroism:

Pale greenish white to darker greenish white or gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Izoklakeite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	44.60	48.50
420 nm	44.10	48.40
440 nm	43.50	48.00
460 nm	42.50	47.40
480 nm	42.20	46.90
500 nm	41.60	46.20
520 nm	41.00	45.70
540 nm	40.60	45.20
560 nm	40.10	44.80
580 nm	39.80	44.40
600 nm	39.60	44.10
620 nm	39.30	43.80
640 nm	39.10	43.50
660 nm	38.80	43.20
680 nm	38.50	42.90
700 nm	38.20	42.50

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

Calculated Properties of Izoklakeite

Electron Density:

r_electron=5.55 gm/cc
note: r_Izoklakeite=6.65 gm/cc.

Fermion Index

Fermion Index = 0.11845
Boson Index = 0.88155

Photoelectric:

PE_Izoklakeite=1,325.67 barns/electron
U=PE_Izoklakeite x r_electron=7,361.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Izoklakeite is Not Radioactive

Izoklakeite Classification

Dana Class:

3.5.12.1 (3)Sulfides - Sulfosalts

(3.5)where 2.5 < z/y < 3 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.5.12)Dana Group

3.5.12.1 Izoklakeite Pb27(Cu,Fe)2(Sb,Bi)19S57 Pnnm 2/m 2/m 2/m

3.5.12.2 Giessenite Pb13(Cu,Ag)(Bi,Sb)9S28(?) P 2₁/n 2/m

Strunz Class:

II/E.33-05 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 Izoklakeite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

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

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Izoklakeite

Pb27(Cu,Fe)2(Sb,Bi)19S57
Dana No: 3.5.12.1 Strunz No: II/E.33-05
Locality:

Notes: