Murunskite Mineral Data

General Murunskite Information

Chemical Formula:

K2Cu3FeS4

Composition:

Molecular Weight = 452.95 gm

Potassium 17.26 % K

Iron 12.33 % Fe

Copper 42.09 % Cu

Sulfur 28.32 % S

______

100.00 %

Empirical Formula:

K₂Cu₃Fe²⁺S₄

Environment:

In rocks that have undergone intensive potassium metasomatism.

IMA Status:

Approved IMA 1981

Locality:

Murunskii massif, between the Charo and Tokko Rivers, Olekminsk, Aldan, Yakutia, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Murunskite + Pronunciation

Synonym:

ICSD 75578

PDF 33-1005

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Murunskite Crystallography

Axial Ratios:

a:c = 1:3.37628

Cell Dimensions:

a = 3.88, c = 13.1, Z = 1; V = 197.21 Den(Calc)= 3.81

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm

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

By Intensity(I/I_o): 6.52(1), 2.53(0.8), 2.9(0.6),

Crystal Structure:

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Mujica C , Paez J , Llanos J , Materials Research Bulletin , 29 (1994) p.263-268, Synthesis and crystal structure of layered chalcogenides [KCuFeS2 and KCuFeSe2], Locality: synthetic

Physical Properties of Murunskite

Cleavage:

{???} Indistinct

Color:

Blue gray, Copper brown, Black.

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

3.5 - Copper Penny

Luster:

Metallic

Optical Properties of Murunskite

RL Anisotrophism:

Moderate, gray to brownish gray white a bluish tint.

RL Color:

Grayish orange cream.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Murunskite in Air**
λ	R	∑ R(λ)
440 nm	15.00
460 nm	15.60
480 nm	16.60
500 nm	17.40
520 nm	18.20
540 nm	19.20
560 nm	20.00
580 nm	21.00
600 nm	21.80
620 nm	22.60
640 nm	23.30
660 nm	24.00
680 nm	24.60
700 nm	25.40

**Calculated Relative Intensity Colors of Murunskite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	550%
R

Calculated Properties of Murunskite

Electron Density:

Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Murunskite =3.81 gm/cc.

Fermion Index:

Fermion Index = 0.0047584522
Boson Index = 0.9952415478

Photoelectric:

PE_Murunskite= 25.74 barns/electron
U=PE_Murunskite x r_electron= 93.11 barns/cc.

Radioactivity:

GRapi = 236.48 (Gamma Ray American Petroleum Institute Units)
Concentration of Murunskite per GRapi unit = 0.42 (%)

Estimated Radioactivity from Murunskite - barely detectable

Murunskite Classification

Dana Class:

02.05.05.03 (02)Sulfides - Including Selenides and Tellurides

(02.05)where Am Bn Xp, with (m+n):p=3:2

(02.05.05)Thalcusite Group

02.05.05.01 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m

02.05.05.02 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m

02.05.05.03 Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m

Strunz Class:

02.BD.30 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BD -With Hg, Tl

02.BD.30 Bukovite Tl2Cu3FeSe4 I 4/mmm 4/m 2/m 2/m

02.BD.30 Murunskite K2Cu3FeS4 I 4/mmm 4/m 2/m 2/m

02.BD.30 Thalcusite TlCu3FeS4 I 4/mmm 4/m 2/m 2/m

Other Murunskite Information

References:

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

See Also:

Links to other databases for Murunskite :
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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Print or Cut-and-Paste your Murunskite Specimen Label here :

Murunskite

K2Cu3FeS4
Dana No: 02.05.05.03 Strunz No: 02.BD.30
Locality:

Notes: