Yarrowite Mineral Data

Yarrowite Mineral Data +

General Yarrowite Information

Chemical Formula:

Cu9S8

Composition:

Molecular Weight = 828.44 gm

Copper 69.03 % Cu

Sulfur 30.97 % S

______

100.00 %

Empirical Formula:

Cu₉S₈

Environment:

As weathering-produced lamellar replacements of other copper sulfides in stratabound re-bed copper deposits (Yarrow and Spionkop Creeks, Canada).

IMA Status:

Approved IMA 1980

Locality:

Yarrow Creek, southwestern Alberta, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA1978-022

Yarrowite Image

Images:

Yarrowite Spionkopite

Comments: Blue-black metallic granular spionkopite, intermixed with yarrowite altering, with quartz.
Location: Yarrow Creek, Alberta, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Yarrowite Spionkopite

Comments: Blue-gray metallic yarrowite grains in granular quartz rock with spionkopite.
Location: Yarrow Creek, Alberta, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Yarrowite Crystallography

Axial Ratios:

a:c = 1:17.7

Cell Dimensions:

a = 3.8, c = 67.26, Z = 3; V = 841.11 Den(Calc)= 4.91

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 3m1 ?

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

By Intensity(I/I_o): 1.899(1), 3.061(0.55), 2.767(0.35),

Physical Properties of Yarrowite

Cleavage:

[0001] Distinct

Color:

Black, Blue.

Density:

4.89

Diaphaniety:

Opaque

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.

Habit:

Tarnishes - Freshly fractured surfaces form a surface oxidation film

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Yarrowite

RL Anisotrophism:

Strong, orange-red.

RL Color:

Blue, blue with a slight violet tint in oil.

RL Pleochroism:

Blue to bluish white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Yarrowite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	19.20	32.90
420 nm	18.60	32.30
440 nm	17.90	31.40
460 nm	16.90	30.50
480 nm	15.60	29.50
500 nm	14.20	28.20
520 nm	12.40	27.00
540 nm	10.70	25.60
560 nm	9.08	24.30
580 nm	7.51	23.10
600 nm	6.15	22.20
620 nm	5.02	22.20
640 nm	4.33	23.00
660 nm	4.38	23.60
680 nm	5.96	23.40
700 nm	9.44	23.00

**Calculated Relative Intensity Colors of Yarrowite in Air**
Relative Intensity	0%	100%	200%	300%	400%	500%	600%	700%	800%	900%	1000%
R₁
R₂

Calculated Properties of Yarrowite

Electron Density:

r_electron=4.61 gm/cc
note: r_Yarrowite=4.91 gm/cc.

Fermion Index

Fermion Index = 0.00232
Boson Index = 0.99768

Photoelectric:

PE_Yarrowite= 32.63 barns/electron
U=PE_Yarrowite x r_electron= 150.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Yarrowite is Not Radioactive

Yarrowite Classification

Dana Class:

2.7.3.1 (2)Sulfides - Including Selenides and Tellurides

(2.7)where Am Bn Xp, with (m+n):p=9:8

(2.7.3)Dana Group

2.7.3.1 Yarrowite Cu9S8 P 3m1 ? 3m

Strunz Class:

II/B.01-80 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 Yarrowite Information

References:

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

See Also:

Links to other databases for Yarrowite :
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 -École des Mines de Paris

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Yarrowite

Cu9S8
Dana No: 2.7.3.1 Strunz No: II/B.01-80
Locality:

Notes: