General Arfvedsonite Information![]() NaNa2(Fe++4Fe+++)Si8O22(OH)2 |
![]() Molecular Weight = 958.89 gm |
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Sodium 7.19 % Na 9.70 % Na2O |
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Iron 29.12 % Fe 29.97 % FeO / 8.33 % Fe2O3 |
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Silicon 23.43 % Si 50.13 % SiO2 |
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Hydrogen 0.21 % H 1.88 % H2O |
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Oxygen 40.04 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
![]() Na3Fe2+4Fe3+(Si8O22)(OH)2 |
![]() Igneous syenites and pegmatites. |
![]() Valid Species (Pre-IMA) 1923 |
![]() Boulder Co., Colorado. Link to MinDat.org Location Data. |
![]() Named after the Swedish chemist, J. A. Arfvedson (1792-1841). |
![]() Arfvedsonite + Pronunciation |
![]() ![]() ICSD 64820 |
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PDF 42-1369 |
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Arfvedsonite Crystallography![]() a:b:c =0.5499:1:0.2944 |
![]() a = 9.9, b = 18, c = 5.3, Z = 2; beta = 104° V = 916.41 Den(Calc)= 3.47 |
![]() Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
![]() By Intensity(I/Io): 3.161(1), 2.732(0.8), 8.51(0.7), |
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| Physical Properties of Arfvedsonite![]() {110} Perfect, {???} Imperfect |
![]() Black, Grayish green, Bluish gray. |
![]() 3.44 - 3.45, Average = 3.44 |
![]() Translucent to opaque |
![]() Brittle - Generally displayed by glasses and most non-metallic minerals. |
![]() Fibrous - Crystals made up of fibers. |
![]() Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
![]() Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point. |
![]() 5.5-6 - Knife Blade-Orthoclase |
![]() Non-fluorescent. |
![]() Vitreous (Glassy) |
![]() bluish gray |
| Optical Properties of Arfvedsonite![]() CI meas= 0.065 (Fair) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.072 (Fair) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1964,KPDmeas= 0.1979,KC= 0.2117 Ncalc = 1.73 ![]() Biaxial (-), a=1.652-1.699, b=1.66-1.705, g=1.666-1.708, bire=0.0090-0.0140, 2V(Calc)=70-80, 2V(Meas)=30-70. Dispersion r > v strong. |
![]() yellow, dark green, dark bluish green, or deep bluish green. |
![]() green, pale brown, dark bluish green, or bluish green. |
![]() bluish gray, black, brownish green, or dirty green. |
| Calculated Properties of Arfvedsonite![]() Bulk Density (Electron Density)=3.37 gm/cc |
note: Specific Gravity of Arfvedsonite =3.45 gm/cc. ![]() Fermion Index = 0.01 |
Boson Index = 0.99 ![]() PEArfvedsonite = 9.68 barns/electron |
U=PEArfvedsonite x rElectron Density= 32.63 barns/cc. ![]() GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Arfvedsonite is Not Radioactive | Arfvedsonite Classification![]() 66.01.03c.09 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.01)with P=2 amphibole configuration |
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(66.01.03c)Group 4, the sodic amphiboles |
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![]() 09.DE.25 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family |
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| Other Arfvedsonite Information![]() NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
![]() Links to other databases for Arfvedsonite : |
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 - Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Athena 6 - EUROmin Project 7 - Ecole des Mines de Paris 8 - GeoScienceWorld 9 - Google Images 10 - Google Scholar 11 - Handbook of Mineralogy (MinSocAm) 12 - Handbook of Mineralogy (UofA) 13 - MinDAT 14 - Mineralienatlas (Deutsch) 15 - Online Mineral Museum 16 - QUT Mineral Atlas 17 - Ruff.Info 18 - UCLA - Petrography Thin-Sections 19 - WWW-MINCRYST Search for Arfvedsonite using: Visit our Advertisers for Arfvedsonite : A Bijoux Google Search for ArfvedsoniteAdam's Minerals Google Search for Arfvedsonite Cape Minerals Google Search for Arfvedsonite Dakota Matrix Minerals Google Search for Arfvedsonite Excalibur Mineral Corp. Google Search for Arfvedsonite Exceptional Minerals Google Search for Arfvedsonite John Betts Fine Minerals Search for Arfvedsonite McDougall Minerals Google Search for Arfvedsonite Mineral News Website Link Rock and Mineral Shows Google Search for Arfvedsonite Weinrich Minerals, Inc. Google Search for Arfvedsonite Ask about Arfvedsonite here : Print or Cut-and-Paste your Arfvedsonite Specimen Label here :
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