Roxbyite Mineral Data

Roxbyite Mineral Data +

General Roxbyite Information

Chemical Formula:

Cu1.78S

Composition:

Molecular Weight = 145.18 gm

Copper 77.91 % Cu

Sulfur 22.09 % S

______

100.00 %

Empirical Formula:

Cu_1.78S

Environment:

Products of corrosion of a 1375 BC bronze harpoon head from a shipwreck.

IMA Status:

Approved IMA 1988

Locality:

Roxby Downs, AS, Australia. Eastern Mediterranean Sea. Link to MinDat.org Location Data.

Name Origin:

Named from the locality.

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Roxbyite Crystallography

Axial Ratios:

a:b:c =1.7407:1:0.4323

Cell Dimensions:

a = 53.79, b = 30.9, c = 13.36, Z = 512; beta = 90° V = 22,205.80 Den(Calc)= 5.56

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): 1.933(1), 2.375(0.9), 1.857(0.8),

Physical Properties of Roxbyite

Cleavage:

[100] Poor

Color:

Bluish black.

Density:

5.555

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic - Dull

Optical Properties of Roxbyite

RL Anisotrophism:

Very weak.

RL Color:

White to off-shite with a blue tinge.

Calculated Properties of Roxbyite

Electron Density:

r_electron=5.18 gm/cc
note: r_Roxbyite=5.56 gm/cc.

Fermion Index

Fermion Index = 0.00165
Boson Index = 0.99835

Photoelectric:

PE_Roxbyite= 36.38 barns/electron
U=PE_Roxbyite x r_electron= 188.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Roxbyite is Not Radioactive

Roxbyite Classification

Dana Class:

2.4.7.4 (2)Sulfides - Including Selenides and Tellurides

(2.4)where Am Bn Xp, with (m+n):p=2:1

(2.4.7)Chalcocite Group ([Cu]2-x S] formulae)

2.4.7.1 Chalcocite Cu2S P 2₁/c 2/m

2.4.7.2 Djurleite Cu31S16 P 2₁/n 2/m

2.4.7.3 Digenite Cu9S5 R 3m 3 2/m

2.4.7.4 Roxbyite Cu1.78S C 2/m 2/m

2.4.7.5 Anilite Cu7S4 P nma 2/m 2/m 2/m

2.4.7.6 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig

2.4.7.7 Spionkopite Cu1.4S P 3m1 ? 3m

Strunz Class:

II/B.01-40 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Coppersulfides Chalcocite group

II/B.01 - Chalcocite - Yarrowite series

II/B.01-10 Chalcocite Cu2S P 2₁/c 2/m

II/B.01-20 Djurleite Cu31S16 P 2₁/n 2/m

II/B.01-30 Digenite Cu9S5 R 3m 3 2/m

II/B.01-40 Roxbyite Cu1.78S C 2/m 2/m

II/B.01-50 Anilite Cu7S4 P nma 2/m 2/m 2/m

II/B.01-60 Geerite Cu8S5 R 3m, R 3m, or R 32 Trig

II/B.01-70 Spionkopite Cu1.4S P 3m1 ? 3m

II/B.01-80 Yarrowite Cu9S8 P 3m1 ? 3m

Other Roxbyite Information

References:

NAME( CanMin, 10/98) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic1)

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

Roxbyite

Cu1.78S
Dana No: 2.4.7.4 Strunz No: II/B.01-40
Locality:

Notes: