Mineralogy Database

Rasvumite Mineral Data

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General Rasvumite Information

Help on Chemical  Formula: Chemical Formula: KFe2S3
Help on Composition: Composition: Molecular Weight = 246.99 gm
   Potassium  15.83 %  K
   Iron       45.22 %  Fe
   Sulfur     38.95 %  S
             100.00 % 
Help on Empirical Formula: Empirical Formula: KFe2+2S3
Help on Environment: Environment: In pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Rasvumchorr and Kidusvumchorr apatite deposits, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Rasvumite + Pronunciation Say RASVUMITE
Help on Synonym: Synonym: ICSD 100180
  PDF 33-1018

Rasvumite Image

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Comments: Opaque dull orange fibrous rasvumite masses.
Location: Coyote Peak, Humboldt County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Reddish brown micro crystals of rasvumite in vugs to about 0.75mm.
Location: Kirovskiy mine, Khibina massif, Kola Peninsula, Russia. Scale: 3.5 x 2.5 x 2.5cm.
© Tom Loomis / Dakota Matrix

Rasvumite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8212:1:0.4928
Help on Cell Dimensions: Cell Dimensions: a = 9.049, b = 11.019, c = 5.431, Z = 4; V = 541.53 Den(Calc)= 3.03
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.99(1), 1.799(0.9), 5.54(0.8),

Physical Properties of Rasvumite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Brownish black, Gray, Black, Steel gray.
Help on Density: Density: 3.1
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Metallic

Optical Properties of Rasvumite

Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Pleochroism: RL Pleochroism: Strong.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Rasvumite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   15.90   23.60 
 420 nm   16.20   23.90 
 440 nm   16.50   24.20 
 460 nm   16.70   23.60 
 480 nm   16.90   23.30 
 500 nm   17.10   23.30 
 520 nm   17.40   23.50 
 540 nm   17.70   23.80 
 560 nm   18.10   24.20 
 580 nm   18.60   24.70 
 600 nm   19.20   25.30 
 620 nm   19.80   25.80 
 640 nm   20.20   26.30 
 660 nm   20.50   26.70 
 680 nm   20.60   27.00 
 700 nm   20.70   27.00 
Calculated Relative Intensity Colors of Rasvumite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%

Calculated Properties of Rasvumite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Rasvumite =3.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERasvumite = 17.34 barns/electron
U=PERasvumite x relectron= 50.64 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 220.07 (Gamma Ray American Petroleum Institute Units)
Concentration of Rasvumite per GRapi unit = 0.45 (%)

Estimated Radioactivity from Rasvumite - barely detectable


Rasvumite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.09)where Am Bn Xp, with (m+n):p=1:1
  (02.09.11)Dana Group Rasvumite KFe2S3 C mcm 2/m 2/m 2/m Pautovite! CsFe2S3 C mcm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 02.FB.20 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O
  02.FB -With Alkalies (without Cl, etc.)
02.FB.20 Rasvumite KFe2S3 C mcm 2/m 2/m 2/m
02.FB.20 Pautovite! CsFe2S3 C mcm 2/m 2/m 2/m

Other Rasvumite Information

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: See Also: Links to other databases for Rasvumite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 02.FB.20





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