Wakabayashilite Mineral Data

General Wakabayashilite Information

Chemical Formula:

[(As,Sb)6S9][As4S5]

Composition:

Molecular Weight = 1,291.80 gm

Antimony 18.85 % Sb

Arsenic 46.40 % As

Sulfur 34.75 % S

______

100.00 %

Empirical Formula:

As₄Sb₂S₉As₄S₅

Environment:

As fibers in druses of quartz or embedded in calcite.

IMA Status:

Approved IMA 1970

Locality:

Nishinomaki mine, Gumma prefrecture, Japan Link to MinDat.org Location Data.

Name Origin:

Named for Yaichiro Wakabayashi (1874-1943), mineralogist for Mitsubishi Mining.

Name Pronunciation:

Wakabayashilite + Pronunciation

Wakabayashilite Image

Images:

Wakabayashilite

Comments: Golden colored, acicular crystals of wakabayashilite on matrix.
Location: White Cap mine, Nye County, Nevada, USA. Scale: Picture size 3 cm.
© Dave Barthelmy

Wakabayashilite Crystallography

Axial Ratios:

a:b:c =1.7346:1:0.4457

Cell Dimensions:

a = 25.262, b = 14.563, c = 6.492, Z = 4; V = 2,388.34 Den(Calc)= 3.59

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P na2₁

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

By Intensity(I/I_o): 6.28(1), 3.49(0.8), 4.78(0.7),

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

Bonazzi P , Lampronti G I , Bindi L , Zandari S , American Mineralogist , 90 (2005) p.1108-1114, Wakabayashilite, [(As,Sb)6S9][As4S5]: crystal structure, psuedosymmetry, twinning,, and revised chemical formula, Sample: White Caps Mine, Nevada

Physical Properties of Wakabayashilite

Cleavage:

{100} Perfect, {010} Perfect, {101} Perfect

Color:

Golden yellow, Lemon.

Density:

3.98

Diaphaneity:

Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Silky

Streak:

orange

Optical Properties of Wakabayashilite

RL Anisotrophism:

Weak.

RL Color:

Golden yellow to lemon-yellow, with golden internal reflections.

RL Pleochroism:

Strong.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Wakabayashilite in Air**
λ	R	∑ R(λ)
400 nm	28.40
420 nm	27.80
440 nm	27.20
460 nm	26.00
480 nm	24.50
500 nm	23.30
520 nm	22.50
540 nm	22.00
560 nm	21.80
580 nm	21.60
600 nm	21.60
620 nm	21.50
640 nm	21.40
660 nm	21.30
680 nm	21.20
700 nm	21.20

**Calculated Relative Intensity Colors of Wakabayashilite in Air**
Relative Intensity	0%	50%	100%	150%	200%	250%	300%	350%	400%
R

Calculated Properties of Wakabayashilite

Electron Density:

Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Wakabayashilite =3.59 gm/cc.

Fermion Index:

Fermion Index = 0.0026063929
Boson Index = 0.9973936071

Photoelectric:

PE_{Wakabayashilite}= 95.48 barns/electron
U=PE_{Wakabayashilite} x rElectron Density= 313.10 barns/cc.

Radioactivity:

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

Wakabayashilite Classification

Dana Class:

02.11.04.01 (02)Sulfides - Including Selenides and Tellurides

(02.11)where Am Bn Xp, with (m+n):p=2:3

(02.11.04)Dana Group

02.11.04.01 Wakabayashilite [(As,Sb)6S9][As4S5] P na2₁ mm2

Strunz Class:

02.FA.40 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O

02.FA -With As, (Sb), S

02.FA.40 Wakabayashilite [(As,Sb)6S9][As4S5] P na2₁ mm2

Other Wakabayashilite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(AmMin, v90, no7, p1108) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Wakabayashilite :
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 Wakabayashilite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Wakabayashilite :

A Bijoux Google Search for Wakabayashilite
Adam's Minerals Google Search for Wakabayashilite
Cape Minerals Google Search for Wakabayashilite
Dakota Matrix Minerals Google Search for Wakabayashilite
Excalibur Mineral Corp. Google Search for Wakabayashilite
Exceptional Minerals Google Search for Wakabayashilite
John Betts Fine Minerals Search for Wakabayashilite
McDougall Minerals Google Search for Wakabayashilite
Mineral News Website Link
Rock and Mineral Shows Google Search for Wakabayashilite
Weinrich Minerals, Inc. Google Search for Wakabayashilite

Ask about Wakabayashilite 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 Wakabayashilite Specimen Label here :

Wakabayashilite

[(As,Sb)6S9][As4S5]
Dana No: 02.11.04.01 Strunz No: 02.FA.40
Locality:

Notes: