General Wakabayashilite Information
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Chemical Formula: |
(As,Sb)11S18 |
Composition: |
Molecular Weight = 1,530.10 gm |
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Antimony 21.88 % Sb |
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Arsenic 40.40 % As |
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Sulfur 37.72 % S |
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______ |
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100.00 % |
Empirical Formula: |
As8.25Sb2.75S18 |
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. |
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Wakabayashilite Image |
Images:
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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 |
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Wakabayashilite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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
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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
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Physical Properties of Wakabayashilite
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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 |
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Optical Properties of Wakabayashilite
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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 |
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∑ R(λ) |
| 400 nm |
28.40 |
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| 420 nm |
27.80 |
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| 440 nm |
27.20 |
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| 460 nm |
26.00 |
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| 480 nm |
24.50 |
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| 500 nm |
23.30 |
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| 520 nm |
22.50 |
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| 540 nm |
22.00 |
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| 560 nm |
21.80 |
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| 580 nm |
21.60 |
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| 600 nm |
21.60 |
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| 620 nm |
21.50 |
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| 640 nm |
21.40 |
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| 660 nm |
21.30 |
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| 680 nm |
21.20 |
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| 700 nm |
21.20 |
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Calculated Relative Intensity Colors of Wakabayashilite in Air
Relative Intensity |
0% |
50% |
100% |
150% |
200% |
250% |
300% |
350% |
400% |
| R |
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Calculated Properties of Wakabayashilite
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Electron Density: |
relectron=3.91 gm/cc note: rWakabayashilite =4.27 gm/cc. |
Fermion Index |
Fermion Index = 0.00282 Boson Index = 0.99718 |
Photoelectric: |
PEWakabayashilite = 100.93 barns/electron U=PEWakabayashilite x relectron= 394.62 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Wakabayashilite is Not Radioactive |
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Wakabayashilite Classification
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Dana Class: |
2.11.4.1 (2)Sulfides - Including Selenides and Tellurides |
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(2.11)where Am Bn Xp, with (m+n):p=2:3 |
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(2.11.4)Dana Group |
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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 |
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II/F - Sulfides with nonmetallic properties, Arsenic-Sulfides |
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II/F.03 - Getchellite - Wakabayashilite series |
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II/F.03-10 Getchellite AsSbS3 P 21/a 2/m |
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II/F.03-20 Wakabayashilite (As,Sb)11S18 P 63/mmc 6/m 2/m 2/m |
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Other Wakabayashilite Information
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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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Print or Cut-and-Paste your Wakabayashilite Specimen Label here :
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Wakabayashilite
(As,Sb)11S18
Dana No: 2.11.4.1 Strunz No: II/F.03-20
Locality:
Notes:
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