Radhakrishnaite Mineral Data

Radhakrishnaite Mineral Data +

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General Radhakrishnaite Information

Chemical Formula:

PbTe3(Cl,S)2

Composition:

Molecular Weight = 657.52 gm

Tellurium 58.22 % Te

Lead 31.51 % Pb

Sulfur 4.88 % S

Chlorine 5.39 % Cl

______

100.00 %

Empirical Formula:

PbTe₃ClS

Environment:

A primary mineral, in a hydrothermal gold-quartz vein containing sulfides and tellurides.

IMA Status:

Approved IMA 1987

Locality:

Champion Reef mine, Kolar gold fields, Karnataka, India. Link to MinDat.org Location Data.

Name Origin:

Named after B. P. Radhakrishna (1918-), Indian mineralogist.

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Radhakrishnaite Crystallography

Axial Ratios:

a:c = 1:0.66024

Cell Dimensions:

a = 5.71, c = 3.77, Z = 1; V = 122.92 Den(Calc)= 8.88

Crystal System:

TetragonalSpace Group: Unk

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

By Intensity(I/I_o): 3.16(1), 3.78(0.6), 1.92(0.5),

Physical Properties of Radhakrishnaite

Color:

Gray, Reddish brown.

Diaphaniety:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Metallic

Optical Properties of Radhakrishnaite

RL Anisotrophism:

Distinct.

RL Color:

Rose-brown.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Radhakrishnaite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	23.70	24.30
420 nm	24.70	25.20
440 nm	25.60	26.10
460 nm	26.60	27.10
480 nm	27.60	28.20
500 nm	28.60	29.20
520 nm	29.60	30.10
540 nm	30.30	31.00
560 nm	31.10	31.80
580 nm	31.80	32.40
600 nm	32.40	32.90
620 nm	32.70	33.30
640 nm	33.00	33.50
660 nm	33.20	33.60
680 nm	33.20	33.60
700 nm	33.20	33.60

**Calculated Relative Intensity Colors of Radhakrishnaite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	340%
R₁
R₂

Calculated Properties of Radhakrishnaite

Electron Density:

r_electron=7.32 gm/cc
note: r_{Radhakrishnaite}=8.88 gm/cc.

Fermion Index

Fermion Index = 0.11652
Boson Index = 0.88348

Photoelectric:

PE_{Radhakrishnaite}= 804.20 barns/electron
U=PE_{Radhakrishnaite} x r_electron=5,886.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Radhakrishnaite is Not Radioactive

Radhakrishnaite Classification

Dana Class:

2.15.4.1 (2)Sulfides - Including Selenides and Tellurides

(2.15)(Chlorides)

(2.15.4)Dana Group

2.15.4.1 Radhakrishnaite PbTe3(Cl,S)2 Unk Tetra

Strunz Class:

II/F.15-20 II - Sulfides and sulphosalts

II/F - Sulfides with nonmetallic properties, Halogensulfides (Sulfohalides) with Mercury/Lead and related compounds

II/F.15 - Kolarite - Radhakrishnaite series

II/F.15-10 Kolarite PbTeCl2 Unk Ortho

II/F.15-20 Radhakrishnaite PbTe3(Cl,S)2 Unk Tetra

Other Radhakrishnaite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Radhakrishnaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Radhakrishnaite

PbTe3(Cl,S)2
Dana No: 2.15.4.1 Strunz No: II/F.15-20
Locality:

Notes: