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Rasvumite Mineral Data
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General Rasvumite Information
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 Chemical Formula: |
KFe2S3 |
| Composition: |
Molecular Weight = 246.99 gm |
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Potassium 15.83 % K |
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Iron 45.22 % Fe |
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Sulfur 38.95 % S |
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______ |
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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 |
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PDF 33-1018 |
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Rasvumite Image |
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Images:
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Images:
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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 |
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Rasvumite Crystallography
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| 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 - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm |
| X Ray Diffraction: |
By Intensity(I/Io): 2.99(1), 1.799(0.9), 5.54(0.8), |
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Physical Properties of Rasvumite
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| 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 |
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Optical Properties of Rasvumite
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| RL Anisotrophism: |
Strong. |
| RL Pleochroism: |
Strong. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Rasvumite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
15.90 |
23.60 |
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| 420 nm |
16.20 |
23.90 |
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| 440 nm |
16.50 |
24.20 |
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| 460 nm |
16.70 |
23.60 |
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| 480 nm |
16.90 |
23.30 |
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| 500 nm |
17.10 |
23.30 |
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| 520 nm |
17.40 |
23.50 |
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| 540 nm |
17.70 |
23.80 |
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| 560 nm |
18.10 |
24.20 |
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| 580 nm |
18.60 |
24.70 |
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| 600 nm |
19.20 |
25.30 |
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| 620 nm |
19.80 |
25.80 |
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| 640 nm |
20.20 |
26.30 |
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| 660 nm |
20.50 |
26.70 |
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| 680 nm |
20.60 |
27.00 |
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| 700 nm |
20.70 |
27.00 |
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Calculated Relative Intensity Colors of Rasvumite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
530% |
| R1 |
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| R2 |
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Calculated Properties of Rasvumite
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| Electron Density: |
Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Rasvumite =3.03 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PERasvumite = 17.34 barns/electron
U=PERasvumite x relectron= 50.64 barns/cc.
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| Radioactivity: |
GRapi = 220.07 (Gamma Ray American Petroleum Institute Units)
Concentration of Rasvumite per GRapi unit = 0.45 (%)
Estimated Radioactivity from Rasvumite  - barely detectable
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Rasvumite Classification
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| Dana Class: |
02.09.11.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.09)where Am Bn Xp, with (m+n):p=1:1 |
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(02.09.11)Dana Group |
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02.09.11.01 Rasvumite KFe2S3 C mcm 2/m 2/m 2/m |
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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 |
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02.F - Sulfides of Arsenic, Alkalies; Sulfides with Halide, Oxide, Hydroxide, H2O |
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02.FB -With Alkalies (without Cl, etc.) |
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02.FB.20 Rasvumite KFe2S3 C mcm 2/m 2/m 2/m |
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02.FB.20 Pautovite! CsFe2S3 C mcm 2/m 2/m 2/m |
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Other Rasvumite Information
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| 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 - 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
17 - WWW-MINCRYST
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Rasvumite
KFe2S3
Dana No: 02.09.11.01 Strunz No: 02.FB.20
Locality:
Notes:
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