Rasvumite Mineral Data

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General Rasvumite Information

Chemical Formula:

KFe2S3

Composition:

Molecular Weight = 246.99 gm

Potassium 15.83 % K

Iron 45.22 % Fe

Sulfur 38.95 % S

______

100.00 %

Empirical Formula:

KFe²⁺₂S₃

Environment:

In pegmatites.

IMA Status:

Approved IMA 1970

Locality:

Rasvumchorr and Kidusvumchorr apatite deposits, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Rasvumite + Pronunciation

Synonym:

ICSD 100180

PDF 33-1018

Rasvumite Image

Images:

Rasvumite

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

Images:

Rasvumite

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

Axial Ratios:

a:b:c =0.8212:1:0.4928

Cell Dimensions:

a = 9.049, b = 11.019, c = 5.431, Z = 4; V = 541.53 Den(Calc)= 3.03

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm

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

By Intensity(I/I_o): 2.99(1), 1.799(0.9), 5.54(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Clark J R , Brown G E , American Mineralogist , 65 (1980) p.477-482, Crystal structure of rasvumite, KFe2S3

Physical Properties of Rasvumite

Cleavage:

{110} Perfect

Color:

Brownish black, Gray, Black, Steel gray.

Density:

3.1

Diaphaneity:

Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Metallic

Optical Properties of Rasvumite

RL Anisotrophism:

Strong.

RL Pleochroism:

Strong.

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**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	530%
R₁
R₂

Calculated Properties of Rasvumite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Rasvumite =3.03 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Rasvumite= 17.34 barns/electron
U=PE_Rasvumite x r_electron= 50.64 barns/cc.

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

Dana Class:

02.09.11.01 (02)Sulfides - Including Selenides and Tellurides

(02.09)where Am Bn Xp, with (m+n):p=1:1

(02.09.11)Dana Group

02.09.11.01 Rasvumite KFe2S3 C mcm 2/m 2/m 2/m

02.09.11.02 Pautovite! CsFe2S3 C mcm 2/m 2/m 2/m

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

References:

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

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 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Rasvumite

KFe2S3
Dana No: 02.09.11.01 Strunz No: 02.FB.20
Locality:

Notes: