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Rathite Mineral Data
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General Rathite Information
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 Chemical Formula: |
Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40 |
| Composition: |
Molecular Weight = 5,369.42 gm |
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Thallium 1.90 % Tl |
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Silver 4.02 % Ag |
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Arsenic 25.81 % As |
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Lead 44.38 % Pb |
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Sulfur 23.89 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Pb11.5Tl0.5Ag2As18.5S40 |
| Environment: |
In crystalline dolomite with other Pb-As-S minerals. |
| IMA Status: |
Valid Species (Pre-IMA) 1896 |
| Locality: |
Binnental, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Gerhard von Rath (1830-1888), Professor of Mineralogy, Bonn, Germany. |
| Name Pronunciation: |
Rathite  |
| Synonym: |
ICSD 26778 |
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PDF 9-426 |
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Rathite-I - rathite or dufrenoysite |
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Wiltshireite |
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gamma-Rathite |
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Rathite Image |
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Images:
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Images:
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Rathite
Comments: Black prismatic crystal of rathite with glossy surface and red realgar on white dolomite.
Location: Lengenbach quarry, Binntal, Valais, Switzerland.
Scale: Crystal length 5 mm.
© Walter Gabriel |
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Rathite Crystallography
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| Axial Ratios: |
a:b:c =1.0661:1:3.1524 |
| Cell Dimensions: |
a = 8.496, b = 7.969, c = 25.122, Z = 1; beta = 100.704° V = 1,671.28 Den(Calc)= 5.33 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n |
| X Ray Diffraction: |
By Intensity(I/Io): 2.75(1), 3.6(0.8), 3.39(0.7), |
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Physical Properties of Rathite
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| Cleavage: |
{100} Perfect, {010} Parting |
| Color: |
Lead gray. |
| Density: |
5.41 |
| Diaphaneity: |
Nearly opaque |
| Fracture: |
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
3 - Calcite |
| Luster: |
Metallic |
| Streak: |
dark brown |
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Optical Properties of Rathite
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| RL Anisotrophism: |
Intense, olive-green or yellow and bluish violet. |
| RL Color: |
White with deep red internal reflections. |
| RL Pleochroism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rathite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
38.60 |
42.90 |
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| 420 nm |
37.80 |
42.20 |
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| 440 nm |
37.00 |
41.50 |
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| 460 nm |
36.20 |
41.00 |
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| 480 nm |
35.50 |
40.50 |
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| 500 nm |
34.90 |
40.00 |
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| 520 nm |
34.30 |
39.60 |
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| 540 nm |
33.80 |
39.20 |
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| 560 nm |
33.30 |
38.60 |
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| 580 nm |
32.80 |
38.00 |
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| 600 nm |
32.20 |
37.10 |
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| 620 nm |
31.60 |
36.20 |
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| 640 nm |
30.80 |
35.40 |
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| 660 nm |
30.00 |
34.70 |
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| 680 nm |
29.20 |
34.10 |
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| 700 nm |
28.40 |
33.60 |
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Calculated Relative Intensity Colors of Rathite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
270% |
280% |
| R1 |
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| R2 |
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Calculated Properties of Rathite
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| Electron Density: |
Bulk Density (Electron Density)=4.62 gm/cc
note: Specific Gravity of Rathite =5.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PERathite = 849.12 barns/electron
U=PERathite x rElectron Density=3,924.49 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rathite is Not Radioactive |
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Rathite Classification
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| Dana Class: |
03.07.12.01 (03)Sulfides - Sulfosalts |
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(03.07)where z/y = 2 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
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(03.07.12)Dana Group |
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03.07.12.01 Rathite Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40 P 21/n 2/m |
| Strunz Class: |
02.HC.05d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.H - Sulfosalts of SnS Archetype |
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02.HC -With only Pb |
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02.HC.05d Dufrenoysite Pb2As2S5 P 21/m 2/m |
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02.HC.05d Rathite Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40 P 21/n 2/m |
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02.HC.05d Veenite Pb2(Sb,As)2S5 P 21cn mm2 |
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Other Rathite Information
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990, AmMin, v 89, p 471) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Rathite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST
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Rathite
Pb8Pb4-x(Tl2As2)x(Ag2As2)As16S40
Dana No: 03.07.12.01 Strunz No: 02.HC.05d
Locality:
Notes:
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