Furutobeite Mineral Data

Furutobeite Mineral Data +

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General Furutobeite Information

Chemical Formula:

(Cu,Ag)6PbS4

Composition:

Molecular Weight = 761.06 gm

Copper 41.75 % Cu

Silver 14.17 % Ag

Lead 27.23 % Pb

Sulfur 16.85 % S

______

100.00 %

Empirical Formula:

Cu₅AgPbS₄

Environment:

In veinlets of stromeyerite that cut bornite in the Kuroko zone of a stratbound, Kuroko-type, massive sufide deposit.

IMA Status:

Approved IMA 1978

Locality:

Furutobe mine, Akita Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

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Furutobeite Crystallography

Axial Ratios:

a:b:c =5.0529:1:2.4489

Cell Dimensions:

a = 20.025, b = 3.963, c = 9.705, Z = 4; beta = 101.57° V = 754.53 Den(Calc)= 6.70

Crystal System:

Monoclinic - DomaticH-M Symbol (m) Space Group: Cm ?

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

By Intensity(I/I_o): 2.5(1), 2.95(0.9), 2.55(0.7),

Physical Properties of Furutobeite

Color:

Gray.

Density:

6.74

Diaphaniety:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3 - Calcite

Luster:

Metallic

Optical Properties of Furutobeite

RL Anisotrophism:

Moderate, from light yellow to dark brown.

RL Color:

Creamy yellow tint.

RL Pleochroism:

Weak.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Furutobeite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	35.70	34.20
420 nm	35.20	34.30
440 nm	35.00	34.50
460 nm	34.70	34.90
480 nm	34.50	35.30
500 nm	34.40	35.60
520 nm	34.40	35.90
540 nm	34.60	36.20
560 nm	34.70	36.30
580 nm	34.80	36.40
600 nm	34.90	36.40
620 nm	34.90	36.30
640 nm	34.90	36.30
660 nm	34.80	36.20
680 nm	34.50	36.10
700 nm	34.30	36.00

**Calculated Relative Intensity Colors of Furutobeite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	260%
R₁
R₂

Calculated Properties of Furutobeite

Electron Density:

r_electron=5.95 gm/cc
note: r_Furutobeite=6.70 gm/cc.

Fermion Index

Fermion Index = 0.06143
Boson Index = 0.93857

Photoelectric:

PE_Furutobeite= 527.62 barns/electron
U=PE_Furutobeite x r_electron=3,139.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Furutobeite is Not Radioactive

Furutobeite Classification

Dana Class:

2.16.12.1 (2)Sulfides - Including Selenides and Tellurides

(2.16)with miscellaneous formulae

(2.16.12)Dana Group

2.16.12.1 Furutobeite (Cu,Ag)6PbS4 Cm ? m

2.16.12.2 Schlemaite! (Cu,[])6(Pb,Bi)Se4 P 2₁/m 2/m

Strunz Class:

II/B.09-40 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Complex Sulfides and Selenides with predominant Copper, Mercury and Thallium

II/B.09 - Danielsite - Furotobeite series

II/B.09-10 Danielsite (Cu,Ag)14HgS8 Unk Ortho

II/B.09-20 Balkanite Cu9Ag5HgS8 P 222 ? 2 2 2

II/B.09-30 Bayankhanite* Cu6HgS4 Unk Hex

II/B.09-40 Furutobeite (Cu,Ag)6PbS4 Cm ? m

II/B.09-50 Schlemaite! (Cu,[])6(Pb,Bi)Se4 P 2₁/m 2/m

Other Furutobeite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

See Also:

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

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

Furutobeite

(Cu,Ag)6PbS4
Dana No: 2.16.12.1 Strunz No: II/B.09-40
Locality:

Notes: