Djurleite Mineral Data

Djurleite Mineral Data +

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General Djurleite Information

Chemical Formula:

Cu31S16

Composition:

Molecular Weight = 2,482.98 gm

Copper 79.34 % Cu

Sulfur 20.66 % S

______

100.00 %

Empirical Formula:

Cu₃₁S₁₆

Environment:

Found with other secondary copper sulfides in enriched zones.

IMA Status:

Approved IMA 1962

Locality:

In the USA, in many of the large porphyry copper deposits of the Western Cordillera including Butte, Silver Bow Co., Montana; Bisbee, Cochise Co. Link to MinDat.org Location Data.

Name Origin:

For S. Djurle, who first synthesized the compound later found in nature.

Synonym:

ICSD 10100

PDF 34-660

Djurleite Image

Images:

Djurleite

Comments: Dark, metallic djurleite with transparent quartz and white calcite.
Location: Dzhezkazgan. Kazakhstan. Scale: 4.5 x 4.5 cm.
© Fabre Minerals

Djurleite Crystallography

Axial Ratios:

a:b:c =1.7079:1:0.8615

Cell Dimensions:

a = 26.9, b = 15.75, c = 13.57, Z = 8; beta = 90.13° V = 5,749.25 Den(Calc)= 5.74

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

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

By Intensity(I/I_o): 1.871(1), 1.964(0.9), 2.387(0.9),

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

Evans H T , Zeitschrift fur Kristallographie , 150 (1979) p.299-320, The crystal structures of low chalocite and djurleite, Locality: Ozark Lead Co. mine at Sweetwater, Missouri, USA

Physical Properties of Djurleite

Cleavage:

None

Color:

Lead gray, Blue black, Black, Black gray.

Density:

5.63

Diaphaniety:

Opaque

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Streak:

metallic

Optical Properties of Djurleite

RL Anisotrophism:

Weak.

RL Color:

Gray.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Djurleite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	34.60	35.80
420 nm	34.20	35.20
440 nm	33.80	34.60
460 nm	33.30	34.00
480 nm	32.60	33.20
500 nm	31.80	32.30
520 nm	30.60	31.20
540 nm	29.60	30.20
560 nm	28.60	29.30
580 nm	27.80	28.60
600 nm	27.00	28.10
620 nm	26.40	27.60
640 nm	25.70	27.10
660 nm	25.00	26.70
680 nm	24.40	26.40
700 nm	23.60	26.10

**Calculated Relative Intensity Colors of Djurleite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R₁
R₂

Calculated Properties of Djurleite

Electron Density:

r_electron=5.34 gm/cc
note: r_Djurleite=5.74 gm/cc.

Fermion Index

Fermion Index = 0.00154
Boson Index = 0.99846

Photoelectric:

PE_Djurleite= 36.99 barns/electron
U=PE_Djurleite x r_electron= 197.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Djurleite is Not Radioactive

Djurleite Classification

Dana Class:

2.4.7.2 (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.01-20 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 Djurleite 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 Djurleite Specimen Label here :

Djurleite

Cu31S16
Dana No: 2.4.7.2 Strunz No: II/B.01-20
Locality:

Notes: