Rayite Mineral Data

Rayite Mineral Data +

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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:

Ag_1.5Tl_0.5Pb₈Sb₈S₂₁

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.

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Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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 - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.37(1), 3.26(0.9), 3.9(0.3),

Physical Properties of Rayite

Cleavage:

None

Color:

Lead gray, Gray.

Diaphaniety:

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:

r_electron=5.19 gm/cc
note: r_Rayite=6.13 gm/cc.

Fermion Index

Fermion Index = 0.10405
Boson Index = 0.89595

Photoelectric:

PE_Rayite= 999.89 barns/electron
U=PE_Rayite x r_electron=5,189.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rayite is Not Radioactive

Rayite Classification

Dana Class:

3.6.20.5 (3)Sulfides - Sulfosalts

(3.6)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.6.20)Fuloppite Group (Monoclinc: C2/c containing Pb, Sb)

3.6.20.1 Fuloppite Pb3Sb8S15 C 2/c 2/m

3.6.20.2 Plagionite Pb5Sb8S17 C 2/c 2/m

3.6.20.3 Heteromorphite Pb7Sb8S19 C 2/c 2/m

3.6.20.4 Semseyite Pb9Sb8S21 C 2/c 2/m

3.6.20.5 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m

Strunz Class:

II/E.21-10 II - Sulfides and sulphosalts

II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0

II/E.21 - Rayite - Fülöppite series

II/E.21-10 Rayite (Ag,Tl)2Pb8Sb8S21 C 2/c 2/m

II/E.21-20 Semseyite Pb9Sb8S21 C 2/c 2/m

II/E.21-30 Heteromorphite Pb7Sb8S19 C 2/c 2/m

II/E.21-40 Plagionite Pb5Sb8S17 C 2/c 2/m

II/E.21-50 Fuloppite Pb3Sb8S15 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 -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 Rayite Specimen Label here :

Rayite

(Ag,Tl)2Pb8Sb8S21
Dana No: 3.6.20.5 Strunz No: II/E.21-10
Locality:

Notes: