Radhakrishnaite
A valid IMA mineral species
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About Radhakrishnaite
B. P. Radhakrishnan
Formula:
PbTe3(Cl,S)2
Colour:
Brownish gray
Lustre:
Metallic
Specific Gravity:
8.89 (Calculated)
Crystal System:
Tetragonal
Name:
Named after Bangalore Puttaiya Radhakrishnan (30 April 1918, Bangalore, India - 26 January 2012, Bangalore, India), Director, Mysore Geological Department.
Unique Identifiers
Mindat ID:
3349
Long-form identifier:
mindat:1:1:3349:3
IMA Classification of Radhakrishnaite
Approved
Approval year:
1983
First published:
1985
Classification of Radhakrishnaite
3.AA.50
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
2.15.4.1
2 : SULFIDES
15 : Chlor-sulfides
2 : SULFIDES
15 : Chlor-sulfides
6.5.10
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
6 : Sulphosalts - Sulphostannates, Sulphogermanates,Sulpharsenates, Sulphantimonates, Sulphovanadates and Sulphohalides
5 : Sulphohalides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Rhk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Radhakrishnaite
Optical Data of Radhakrishnaite
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 400nm | 23.7% | 24.3% |
| 420nm | 24.7% | 25.2% |
| 440nm | 25.6% | 26.1% |
| 460nm | 26.6% | 27.1% |
| 480nm | 27.6% | 28.2% |
| 500nm | 28.6% | 29.2% |
| 520nm | 29.6% | 30.1% |
| 540nm | 30.3% | 31.0% |
| 560nm | 31.1% | 31.8% |
| 580nm | 31.8% | 32.4% |
| 600nm | 32.4% | 32.9% |
| 620nm | 32.7% | 33.3% |
| 640nm | 33.0% | 33.5% |
| 660nm | 33.2% | 33.6% |
| 680nm | 33.2% | 33.6% |
| 700nm | 33.2% | 33.6% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 33.6%.
R1 shown in black, R2 shown in red
Colour in reflected light:
gray
Chemistry of Radhakrishnaite
Mindat Formula:
PbTe3(Cl,S)2
Element Weights:
Elements listed:
Crystallography of Radhakrishnaite
Crystal System:
Tetragonal
Cell Parameters:
a = 5.71(5) Å, c = 3.77(5) Å
Ratio:
a:c = 1 : 0.66
Unit Cell V:
122.92 ų (Calculated from Unit Cell)
Z:
1
Comment:
space group P4/m, P4, P-4, P422, P4mm, P42m or P4m2 and P4/mmm
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.16 Å | (100) |
| 3.78 Å | (60) |
| 1.92 Å | (50) |
| 1.78 Å | (50) |
| 2.73 Å | (40) |
| 2.29 Å | (40) |
| 1.59 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Radhakrishnaite
General Appearance of Type Material:
Intergrowths with kolarite, as 20-40 micron aggregates that replace altaite inclusions in galena.
Place of Conservation of Type Material:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
hydrothermal gold deposit
Associated Minerals at Type Locality:
Synonyms of Radhakrishnaite
Other Language Names for Radhakrishnaite
Related Minerals - Strunz-mindat Grouping
| 3.AA. | Brontesite | (NH4)3PbCl5 |
| 3.AA.05 | Marshite | CuI |
| 3.AA.05 | Nantokite | CuCl |
| 3.AA.05 | 'UM1999-11:I:CuS' | Cu(I,S) |
| 3.AA.05 | Miersite | (Ag,Cu)I |
| 3.AA.10 | Tocornalite | (Ag,Hg)I (?) |
| 3.AA.10 | Iodargyrite | AgI |
| 3.AA.15 | Bromargyrite | AgBr |
| 3.AA.15 | Chlorargyrite | AgCl |
| 3.AA.20 | Sylvite | KCl |
| 3.AA.20 | Halite | NaCl |
| 3.AA.20 | Villiaumite | NaF |
| 3.AA.20 | Carobbiite | KF |
| 3.AA.20 | Griceite | LiF |
| 3.AA.25 | 'UM1998-03-Cl:Tl' | TlCl |
| 3.AA.25 | Nataliyamalikite | TlI |
| 3.AA.25 | Lafossaite | Tl(Cl,Br) |
| 3.AA.25 | Salammoniac | NH4Cl |
| 3.AA.30 | Calomel | [Hg2]2+Cl2 |
| 3.AA.30 | Moschelite | [Hg2]2+I2 |
| 3.AA.30 | Kuzminite | HgBr |
| 3.AA.35 | Neighborite | NaMgF3 |
| 3.AA.35 | Parascandolaite | KMgF3 |
| 3.AA.40 | Javorieite | KFeCl3 |
| 3.AA.40 | Chlorocalcite | KCaCl3 |
| 3.AA.45 | Kolarite | PbTeCl2 |
| 3.AA.55 | Challacolloite | KPb2Cl5 |
| 3.AA.60 | Hephaistosite | TlPb2Cl5 |
| 3.AA.90 | Pseudocotunnite | K2PbCl4 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Radhakrishnaite
mindat.org URL:
https://www.mindat.org/min-3349.html
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References for Radhakrishnaite
Reference List:
Localities for Radhakrishnaite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
China | |
| Minzhi Yang (2006) |
| Zhang et al. (2024) |
India (TL) | |
| Genkin et al. (1985) |
Russia | |
| Excalibur Mineral Company SEM/EDS ... |
| Chernyavsky et al. (2012) +1 other reference |
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Oktyabrsky Mine, Talnakh Cu-Ni Deposit, Norilsk-Talnakh Mining Region, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Krasnoyarsk Krai, Russia