| |
 |
Rayite Mineral Data
|
|
|
General Rayite Information
|
 Chemical Formula: |
(Ag,Tl)2Pb8Sb8S21 |
| Composition: |
Molecular Weight = 3,568.98 gm |
| |
Thallium 2.86 % Tl |
| |
Silver 4.53 % Ag |
| |
Antimony 27.29 % Sb |
| |
Lead 46.44 % Pb |
| |
Sulfur 18.87 % S |
| |
______ |
| |
100.00 % |
| Empirical Formula: |
Ag1.5Tl0.5Pb8Sb8S21 |
| Environment: |
In Precambrian polymetallic massive-sufide deposits interbedded with kyanite-graphite schists, diopside-bearing calcsilicates, and meta cherts. |
| IMA Status: |
Approved IMA 1983 |
| Locality: |
Rajpura-Darib, Udaipur district, Rajasthan, India. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Santosh K. Ray of President College, Calcutta, India. |
| Name Pronunciation: |
Rayite  |
| |
Rayite Crystallography
|
| Axial Ratios: |
a:b:c =1.1371:1:2.0476 |
| Cell Dimensions: |
a = 13.6, b = 11.96, c = 24.49, Z = 4; beta = 103.94° V = 3,866.13 Den(Calc)= 6.13 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.37(1), 3.26(0.9), 3.9(0.3), |
| |
Physical Properties of Rayite
|
| Cleavage: |
None |
| Color: |
Lead gray, Gray. |
| Diaphaneity: |
Opaque |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
2.5 - Finger Nail |
| Luster: |
Metallic |
| Streak: |
lead gray |
| |
Optical Properties of Rayite
|
| RL Anisotrophism: |
Perceptible, from dark blue to dark reddish brown. |
| RL Color: |
White with greenish and bluish tints. |
| RL Pleochroism: |
Greenish to greenish blue. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rayite in Air
| λ |
R1 |
R2 |
 |
∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
38.30 |
41.80 |
|
|
|
| 420 nm |
38.00 |
41.30 |
|
| 440 nm |
37.80 |
40.90 |
|
| 460 nm |
37.60 |
40.60 |
|
| 480 nm |
37.60 |
40.40 |
|
| 500 nm |
37.50 |
40.10 |
|
| 520 nm |
37.50 |
39.90 |
|
| 540 nm |
37.50 |
39.60 |
|
| 560 nm |
37.40 |
39.40 |
|
| 580 nm |
37.20 |
38.90 |
|
| 600 nm |
37.00 |
38.40 |
|
| 620 nm |
36.70 |
37.90 |
|
| 640 nm |
36.30 |
37.50 |
|
| 660 nm |
35.90 |
37.30 |
|
| 680 nm |
35.60 |
37.20 |
|
| 700 nm |
35.30 |
37.10 |
|
Calculated Relative Intensity Colors of Rayite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
240% |
| R1 |
|
|
|
|
|
|
|
|
|
|
| R2 |
|
|
|
|
|
|
|
|
|
|
|
| |
Calculated Properties of Rayite
|
| Electron Density: |
Bulk Density (Electron Density)=5.19 gm/cc
note: Specific Gravity of Rayite =6.13 gm/cc.
|
| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PERayite = 999.89 barns/electron
U=PERayite x rElectron Density=5,189.93 barns/cc.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rayite is Not Radioactive |
| |
Rayite Classification
|
| Dana Class: |
03.06.20.05 (03)Sulfides - Sulfosalts |
| |
(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals |
| |
(03.06.20)Fuloppite Group (Monoclinc: C2/c containing Pb, Sb) |
| |
03.06.20.01 Fuloppite Pb3Sb8S15 C 2/c 2/m |
| |
03.06.20.02 Plagionite Pb5Sb8S17 C 2/c 2/m |
| |
03.06.20.03 Heteromorphite Pb7Sb8S19 C 2/c 2/m |
| |
03.06.20.04 Semseyite Pb9Sb8S21 C 2/c 2/m |
| |
03.06.20.05 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m |
| Strunz Class: |
02.HC.10d 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
| |
02.H - Sulfosalts of SnS Archetype |
| |
02.HC -With only Pb |
| |
02.HC.10d Semseyite Pb9Sb8S21 C 2/c 2/m |
| |
02.HC.10d Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m |
| |
Other Rayite Information
|
| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Rayite :
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 Rayite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Rayite :
Ask about Rayite 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
Espaņol
Print or Cut-and-Paste your Rayite Specimen Label here :
|
Rayite
(Ag,Tl)2Pb8Sb8S21
Dana No: 03.06.20.05 Strunz No: 02.HC.10d
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.