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.

Name Pronunciation:

Radhakrishnaite + Pronunciation

Radhakrishnaite Image

Images:

Click Here for Larger Radhakrishnaite Image

Radhakrishnaite Kolarite

Comments: Kolarite (1) and radhakrishnaite (2), replacing altaite (white) in galena (ight grey). (CanMin, v23:501).
Location: 1500 m level, Kolar gold deposit, India. Scale: Scale Bar 0.02 mm.
© Canadian Mineralogist

Images:

Radhakrishnaite

Comments: Polished Section image of radhakrishnaite (Rad) with bluish to brownish tarnishing colors.
Location: Oktyabrsky Mine, Norilsk, Russia. Scale: Picture Size 0.16 mm.
© Thomas Witzke

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.

Diaphaneity:

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:

Bulk Density (Electron Density)=7.32 gm/cc
note: Specific Gravity of Radhakrishnaite =8.88 gm/cc.

Fermion Index:

Fermion Index = 0.11
Boson Index = 0.89

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Radhakrishnaite is Not Radioactive

Radhakrishnaite Classification

Dana Class:

02.15.04.01 (02)Sulfides - Including Selenides and Tellurides

(02.15)(Chlorides)

(02.15.04)Dana Group

02.15.04.01 Radhakrishnaite PbTe3(Cl,S)2 Unk Tetra

Strunz Class:

03.AA.50 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.50 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Radhakrishnaite Specimen Label here :

Radhakrishnaite

PbTe3(Cl,S)2
Dana No: 02.15.04.01 Strunz No: 03.AA.50
Locality:

Notes: