Junoite Mineral Data

Junoite Mineral Data +

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General Junoite Information

Chemical Formula:

Pb3Cu2Bi8(S,Se)16

Composition:

Molecular Weight = 3,121.17 gm

Copper 4.07 % Cu

Bismuth 53.56 % Bi

Lead 19.92 % Pb

Selenium 10.12 % Se

Sulfur 12.33 % S

______

100.00 %

Empirical Formula:

Pb₃Cu₂Bi₈S₁₂Se₄

Environment:

Of hydrothermal origin.

IMA Status:

Approved IMA 1975

Locality:

In the Juno mine, Tennant Creek, Northern Territory, Australia. Link to MinDat.org Location Data.

Name Origin:

For the Juno mine, Australia, in which it was first found.

Synonym:

ICSD 30777

PDF 42-567

Junoite Image

Images:

Junoite

Comments: Solid crystalline mass of dark gray, metallic junoite. Partially sawed indicating analytical verification.
Location: 700 level, Juno Mine, Tennant Creek, Northern Territory, Australia. Scale: 3x2x2cm.
© Tom Loomis / Dakota Matrix

Junoite Crystallography

Axial Ratios:

a:b:c =6.5665:1:4.1945

Cell Dimensions:

a = 26.66, b = 4.06, c = 17.03, Z = 2; beta = 127.2° V = 1,468.26 Den(Calc)= 7.06

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.545(1), 3.904(0.8), 2.919(0.7),

Crystal Structure:

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

Mumme W G , American Mineralogist , 60 (1975) p.548-558, Junoite, Cu2Pb3Bi8(S,Se)16, a new sulfosalt from Tennant Creek, Australia:, Its crystal structure and relationship with other bismuth sulfosalts

Physical Properties of Junoite

Cleavage:

[???] Good

Color:

Gray.

Density:

6.77

Diaphaniety:

Opaque

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Metallic

Optical Properties of Junoite

Optical Data:

NCalc= 1.92 - from Gladstone-Dale relationship (KC = 0.1306) where Ncalc=Dcalc*KC+1
NCalc= 1.88 - from Gladstone-Dale relationship (KC = 0.1306) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong.

RL Color:

Creamy white.

RL Pleochroism:

Strong, from cream to gray with green and mauve tints.

Calculated Properties of Junoite

Electron Density:

r_electron=5.86 gm/cc
note: r_Junoite=7.06 gm/cc.

Fermion Index

Fermion Index = 0.05262
Boson Index = 0.94738

Photoelectric:

PE_Junoite=1,417.51 barns/electron
U=PE_Junoite x r_electron=8,310.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Junoite is Not Radioactive

Junoite Classification

Dana Class:

3.7.14.1 (3)Sulfides - Sulfosalts

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

(3.7.14)Dana Group

3.7.14.1 Junoite Pb3Cu2Bi8(S,Se)16 C 2/m 2/m

3.7.14.2 Felbertalite! Cu2Pb6Bi8S19 C 2/m 2/m

Strunz Class:

II/E.34-80 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.34 - Cosalite - Galenobismuthite

II/E.34-08 Mozgovaite! PbBi4(S,Se)7 Bbmm 2/m 2/m 2/m

II/E.34-10 Cosalite Pb2Bi2S5 Pbnm 2/m 2/m 2/m

II/E.34-20 Proudite (Pb,Cu)8Bi9-10(S,Se)22 C 2/m 2/m

II/E.34-30 Weibullite Pb6Bi8(S,Se)18 P nma 2/m 2/m 2/m

II/E.34-60 Cannizzarite Pb4Bi6S13 C 2/m 2/m

II/E.34-65 Wittite Pb3Bi4(S,Se)9 P 2/m 2/m

II/E.34-70 Nordstromite Pb3CuBi7(S10Se4) P 2₁/m 2/m

II/E.34-80 Junoite Pb3Cu2Bi8(S,Se)16 C 2/m 2/m

II/E.34-85 Felbertalite! Cu2Pb6Bi8S19 C 2/m 2/m

II/E.34-90 Watkinsonite PbCu2Bi4(Se,S)8 Pm ? m

II/E.34-100 Paderaite AgPb2Cu6Bi11S22 P 2₁/m 2/m

II/E.34-110 Galenobismutite PbBi2S4 Pnam 2/m 2/m 2/m

Other Junoite Information

References:

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

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

Junoite

Pb3Cu2Bi8(S,Se)16
Dana No: 3.7.14.1 Strunz No: II/E.34-80
Locality:

Notes: