General Arfvedsonite Information
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Chemical Formula: |
NaNa2(Fe++4Fe+++)Si8O22(OH)2 |
Composition: |
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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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Na3Fe2+4Fe3+(Si8O22)(OH)2 |
Environment: |
Igneous syenites and pegmatites. |
IMA Status: |
Valid Species (Pre-IMA) 1923 |
Locality: |
Boulder Co., Colorado. Link to MinDat.org Location Data. |
Name Origin: |
Named after the Swedish chemist, J. A. Arfvedson (1792-1841). |
Synonym: |
ICSD 64820 |
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PDF 42-1369 |
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Arfvedsonite Image |
Images:
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Arfvedsonite
Comments: Prismatic crystals of black arfvedsonite in white feldspar matrix.
Location: Kangerdluarsuk, Il?maussaq Massif, Greenland.
Scale: 8x3x3 cm.
© John Betts - Fine Minerals |
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Images:
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Arfvedsonite Crystallography
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Axial Ratios: |
a:b:c =0.5499:1:0.2944 |
Cell Dimensions: |
a = 9.9, b = 18, c = 5.3, Z = 2; beta = 104° V = 916.41 Den(Calc)= 3.47 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m |
X Ray Diffraction: |
By Intensity(I/Io): 3.161(1), 2.732(0.8), 8.51(0.7), |
Crystal Structure:
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Hawthorne F C , The Canadian Mineralogist , 14 (1976) p.346-356, The crystal chemistry of the amphiboles: V. The structure and, chemistry of arfvedsonite
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Physical Properties of Arfvedsonite
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Cleavage: |
[110] Perfect, [???] Imperfect |
Color: |
Black, Grayish green, Bluish gray. |
Density: |
3.44 - 3.45, Average = 3.44 |
Diaphaniety: |
Translucent to opaque |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Habit: |
Fibrous - Crystals made up of fibers. |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Habit: |
Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point. |
Hardness: |
5.5-6 - Knife Blade-Orthoclase |
Luminescence: |
Non-fluorescent. |
Luster: |
Vitreous (Glassy) |
Streak: |
bluish gray |
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Optical Properties of Arfvedsonite
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Optical Data: |
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. |
Pleochroism (x): |
yellow, dark green, dark bluish green, or deep bluish green. |
Pleochroism (y): |
green, pale brown, dark bluish green, or bluish green. |
Pleochroism (z): |
bluish gray, black, brownish green, or dirty green. |
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Calculated Properties of Arfvedsonite
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Electron Density: |
relectron=3.39 gm/cc note: rArfvedsonite =3.47 gm/cc. |
Fermion Index |
Fermion Index = 0.0173 Boson Index = 0.9827 |
Photoelectric: |
PEArfvedsonite = 9.68 barns/electron U=PEArfvedsonite x relectron= 32.86 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Arfvedsonite is Not Radioactive |
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Arfvedsonite Classification
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Dana Class: |
66.1.3c.9 (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.1)Dana Type |
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(66.1.3c)Group 4, the sodic amphiboles |
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66.1.3c.1 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.2 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.3 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.4 Magnesioriebeckite []Na2(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.5 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.6 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.7 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.8 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.9 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.9a Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m |
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66.1.3c.9b Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m |
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66.1.3c.10 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.11 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3c.11a Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3c.11b Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m |
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66.1.3c.11c Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m |
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66.1.3c.12 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m |
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66.1.3c.12a Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m |
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66.1.3c.12b Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m |
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66.1.3c.13 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m |
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66.1.3c.14 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m |
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66.1.3c.15 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m |
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66.1.3c.16 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m |
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66.1.3c.17 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m |
Strunz Class: |
VIII/F.08-100 VIII - Silicates |
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VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Alkali-Amphiboles |
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VIII/F.08 - Amphibole group, Glaucophane - Riebeckite - Kozulite series |
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VIII/F.08-10 Glaucophane []Na2(Mg3Al2)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-20 Ferroglaucophane []Na2(Fe3Al2)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-30 Crossite? Na2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-40 Magnesioriebeckite []Na2(Mg3Fe2)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-50 Riebeckite []Na2(Fe3Fe2)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-56 Fluoronyboite! NaNa2(Al2Mg3)(Si7Al)O22(F,OH)2 C 2/m 2/m |
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VIII/F.08-60 Nyboite NaNa2(Mg3Al2)Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.08-65 Ferronyboite! NaNa2(Fe)3Al2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.08-67 Ferric-ferronyboite! NaNa2(Fe)3(Fe)2(Si7Al)O22(OH)2 C 2/m 2/m |
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VIII/F.08-70 Eckermannite NaNa2(Mg4Al)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-80 Ferro-eckermannite NaNa2(Fe4Al)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-81 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-83 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m |
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VIII/F.08-84 Ferroleakeite! NaNa2(Fe)3(Fe)2Li(Si8O22)(OH)2 C 2/m 2/m |
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VIII/F.08-85 Leakeite NaNa2(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-86 Fluoro-ferroleakeite NaNa2(Fe2Fe2Li)Si8O22F2 C 2/m 2/m |
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VIII/F.08-87 Kornite Na(CaNa)Fe4(Al,Fe)Si7AlO22(OH)2 C 2/m 2/m |
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VIII/F.08-88 Ungarettiite NaNa2(Mn2Mn3)Si8O22O2 C 2/m 2/m |
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VIII/F.08-89 Obertiite! NaNa2(Mg3FeTi)Si8O22(O,F,OH)2 C 2/m 2/m |
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VIII/F.08-90 Magnesio-arfvedsonite NaNa2(Mg4Fe)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-92 Fluoro-magnesio-arfvedsonite! NaNa2(Mg,Fe)4Fe[Si8O22](F,OH)2 C 2/m 2/m |
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VIII/F.08-95 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-100 Arfvedsonite NaNa2(Fe4Fe)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-105 Ferriwhittakerite! Na(NaLi)(Mg2Fe2Li)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-110 Kozulite NaNa2Mn4(Fe,Al)Si8O22(OH)2 C 2/m 2/m |
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VIII/F.08-112 Potassicleakeite! KNa2Mg2Fe2LiSi8O22(OH)2 C 2/m 2/m |
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VIII/F.08-125 Dellaventuraite! NaNa2(Mg2,Mn,Li,Ti)Si8O22O2 C 2/m 2/m |
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VIII/F.08-157 Potassicarfvedsonite! KNa2Fe4FeSi8O22(OH)2 C 2/m 2/m |
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Other Arfvedsonite Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65) |
See Also: |
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 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - MinMax(Deutsch)
14 - MinMax(English)
15 - Mineralienatlas (Deutsch)
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - UCLA - Petrography Thin-Sections
19 - WWW-MINCRYST
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Arfvedsonite
NaNa2(Fe++4Fe+++)Si8O22(OH)2
Dana No: 66.1.3c.9 Strunz No: VIII/F.08-100
Locality:
Notes:
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