Wakabayashilite Mineral Data

Wakabayashilite Mineral Data +

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General Wakabayashilite Information

Chemical Formula:

(As,Sb)11S18

Composition:

Molecular Weight = 1,530.10 gm

Antimony 21.88 % Sb

Arsenic 40.40 % As

Sulfur 37.72 % S

______

100.00 %

Empirical Formula:

As_8.25Sb_2.75S₁₈

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.

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:c = 1:0.44493

Cell Dimensions:

a = 14.564, c = 6.48, Z = 2; V = 1,190.33 Den(Calc)= 4.27

Crystal System:

Hexagonal - Dihexagonal DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

$Help on X Ray Diffraction:$ 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

Diaphaniety:

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:

r_electron=3.91 gm/cc
note: r_{Wakabayashilite}=4.27 gm/cc.

Fermion Index

Fermion Index = 0.00282
Boson Index = 0.99718

Photoelectric:

PE_{Wakabayashilite}= 100.93 barns/electron
U=PE_{Wakabayashilite} x r_electron= 394.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wakabayashilite is Not Radioactive

Wakabayashilite Classification

Dana Class:

2.11.4.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.11.4)Dana Group

2.11.4.1 Wakabayashilite (As,Sb)11S18 P 6₃/mmc 6/m 2/m 2/m

Strunz Class:

II/F.03-20 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Arsenic-Sulfides

II/F.03 - Getchellite - Wakabayashilite series

II/F.03-10 Getchellite AsSbS3 P 2₁/a 2/m

II/F.03-20 Wakabayashilite (As,Sb)11S18 P 6₃/mmc 6/m 2/m 2/m

Other Wakabayashilite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Wakabayashilite :
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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Wakabayashilite

(As,Sb)11S18
Dana No: 2.11.4.1 Strunz No: II/F.03-20
Locality:

Notes: