Mineralogy Database

Rayite Mineral Data

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General Rayite Information

Help on Chemical  Formula: Chemical Formula: (Ag,Tl)2Pb8Sb8S21
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: Ag1.5Tl0.5Pb8Sb8S21
Help on Environment: Environment: In Precambrian polymetallic massive-sufide deposits interbedded with kyanite-graphite schists, diopside-bearing calcsilicates, and meta cherts.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Rajpura-Darib, Udaipur district, Rajasthan, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Santosh K. Ray of President College, Calcutta, India.
Help on Name Pronunciation: Name Pronunciation: Rayite Say RAYITE

Rayite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1371:1:2.0476
Help on Cell Dimensions: Cell Dimensions: a = 13.6, b = 11.96, c = 24.49, Z = 4; beta = 103.94° V = 3,866.13 Den(Calc)= 6.13
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.37(1), 3.26(0.9), 3.9(0.3),

Physical Properties of Rayite

Help on Cleavage: Cleavage: None
Help on Color: Color: Lead gray, Gray.
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray

Optical Properties of Rayite

Help on RL Anisotrophism: RL Anisotrophism: Perceptible, from dark blue to dark reddish brown.
Help on RL Color: RL Color: White with greenish and bluish tints.
Help on RL Pleochroism: RL Pleochroism: Greenish to greenish blue.
Help on Reflectivity 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
   0%   30%   60%   90% 100% 120% 150% 180% 210% 240%

Calculated Properties of Rayite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.19 gm/cc
note: Specific Gravity of Rayite =6.13 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PERayite = 999.89 barns/electron
U=PERayite x rElectron Density=5,189.93 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rayite is Not Radioactive

Rayite Classification

Help on  Dana Class: Dana Class: (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) Fuloppite Pb3Sb8S15 C 2/c 2/m Plagionite Pb5Sb8S17 C 2/c 2/m Heteromorphite Pb7Sb8S19 C 2/c 2/m Semseyite Pb9Sb8S21 C 2/c 2/m Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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

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Dana No: Strunz No: 02.HC.10d





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