Fenaksite Mineral Data + 
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- 70.1.1.1 Litidionite KNaCuSi4O10 P1 1
- 70.1.1.2 Fenaksite (K,Na,Ca)4(Fe,Fe,Mn)2Si8O20(OH,F) P1 1
- 70.1.1.3 Manaksite KNaMnSi4O10 P1 1
- 70.1.1.4 Agrellite NaCa2Si4O10F P1 1
- VIII/H.04-10 Fenaksite (K,Na,Ca)4(Fe,Fe,Mn)2Si8O20(OH,F) P1 1
- VIII/H.04-20 Manaksite KNaMnSi4O10 P1 1
- VIII/H.04-30 Ershovite Na4K3(Fe,Mn,Ti)2Si8O20(OH)4·5(H2O) P1 1
General Fenaksite Information |
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 Chemical Formula: |
(K,Na,Ca)4(Fe++,Fe+++,Mn)2Si8O20(OH,F) | ||
| Composition: |
Molecular Weight = 806.42 gm | ||
| Potassium 8.73 % K 10.51 % K2O | |||
| Sodium 4.28 % Na 5.76 % Na2O | |||
| Calcium 3.48 % Ca 4.87 % CaO | |||
| Manganese 2.04 % Mn 2.64 % MnO | |||
| Iron 11.77 % Fe 11.58 % FeO / 3.96 % Fe2O3 | |||
| Silicon 27.86 % Si 59.61 % SiO2 | |||
| Hydrogen 0.10 % H 0.89 % H2O | |||
| Oxygen 41.27 % O | |||
| Fluorine 0.47 % F 0.47 % F | |||
| - % F -0.20 % -O=F2 | |||
| ______ ______ | |||
| 100.00 % 100.10 % = TOTAL OXIDE | |||
| Empirical Formula: |
K1.8Na1.5Ca0.7Fe2+1.3Fe3+0.4Mn2+0.3Si8O20(OH)0.8F0.2 | ||
| Environment: |
In pegmatites associated with an ijolite-urtite intrusion in a differentiated alkalic massif. | ||
| IMA Status: |
Approved IMA 1959 | ||
| Locality: |
On Mts. Rasvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. | ||
| Name Origin: |
Named for the Fe, Na, K, and Si in the formula. | ||
| Synonym: |
ICSD 20098 | ||
| PDF 13-520 | |||
Fenaksite Image | |||
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Images:
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Fenaksite Crystallography |
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| Axial Ratios: |
a:b:c =0.847:1:1.2111 | ||
| Cell Dimensions: |
a = 6.98, b = 8.24, c = 9.98, Z = 1; alpha = 114.2°, beta = 80.22°, gamma = 115.6° V = 465.30 Den(Calc)= 2.88 | ||
| Crystal System: |
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 3.03(1), 2.46(0.7), 3.55(0.7), | ||
Physical Properties of Fenaksite |
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| Cleavage: |
[100] Good, [010] Good | ||
| Color: |
Brown, Light pink. | ||
| Density: |
2.744 | ||
| Diaphaniety: |
Transparent to Translucent | ||
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. | ||
| Hardness: |
5-5.5 - Apatite-Knife Blade | ||
| Luster: |
Pearly | ||
| Streak: |
white | ||
Optical Properties of Fenaksite |
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| Optical Data: |
Biaxial (+), a=1.541, b=1.56, g=1.567, bire=0.0260, 2V(Calc)=60, 2V(Meas)=84. | ||
Calculated Properties of Fenaksite |
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| Electron Density: |
relectron=2.84 gm/cc |
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| Fermion Index |
Fermion Index = 0.01576 Boson Index = 0.98424 |
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| Photoelectric: |
PEFenaksite = 6.44 barns/electron |
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| Radioactivity: |
GRapi = 124.09 (Gamma Ray American Petroleum Institute Units) Estimated Radioactivity from Fenaksite |
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Fenaksite Classification |
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| Dana Class: |
70.1.1.2 (70)Inosilicate Column or Tube Structures | ||
| (70.1)with columnar silicate units | |||
| (70.1.1)Dana Group | |||
| Strunz Class: |
VIII/H.04-10 VIII - Silicates | ||
| VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others | |||
| VIII/H.04 - Fenaksite series | |||
Other Fenaksite Information |
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| References: |
NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) | ||
| See Also: |
Links to other databases for Fenaksite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris Search for Fenaksite using: Visit our Advertisers for Fenaksite : Translate Fenaksite Mineral Data : Ask about Fenaksite here : Print or Cut-and-Paste your Fenaksite Specimen Label here :
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- barely detectable 
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