Yarrowite Mineral Data

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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.

Name Pronunciation:

Yarrowite + Pronunciation

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

Diaphaneity:

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:

Bulk Density (Electron Density)=4.61 gm/cc
note: Specific Gravity of Yarrowite =4.91 gm/cc.

Fermion Index:

Fermion Index = 0.0023223835
Boson Index = 0.9976776165

Photoelectric:

PE_Yarrowite= 32.63 barns/electron
U=PE_Yarrowite x rElectron Density= 150.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Yarrowite is Not Radioactive

Yarrowite Classification

Dana Class:

02.07.03.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.07.03)Dana Group

02.07.03.01 Yarrowite Cu9S8 P 3m1 ? 3m

Strunz Class:

02.CA.05d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CA -With Cu

02.CA.05d 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Yarrowite using:

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Ask about Yarrowite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Yarrowite

Cu9S8
Dana No: 02.07.03.01 Strunz No: 02.CA.05d
Locality:

Notes: