Arfvedsonite Root Name Group
A group of related mineral species
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About Arfvedsonite Root Name Group
Formula:
ANa2(C2+4Fe3+}Si8O22W2
The arfvedsonite minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Fe3+ as the dominant element in the C3+ position. The individual members are defined by their dominant element in the A, C2+ and W position.
Crystal System:
Monoclinic
Name:
Named for Johan A. Arfvedson (Arfwedson) (1792-1841), Swedish chemist.
This page provides mineralogical data about Arfvedsonite Root Name Group.
Unique Identifiers
Mindat ID:
8603
Long-form identifier:
mindat:1:1:8603:1
Chemistry of Arfvedsonite Root Name Group
Mindat Formula:
ANa2(C2+4Fe3+}Si8O22W2
The arfvedsonite minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Fe3+ as the dominant element in the C3+ position. The individual members are defined by their dominant element in the A, C2+ and W position.
The arfvedsonite minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < C(Al+Fe3++2Ti) < 1.5 apfu with Fe3+ as the dominant element in the C3+ position. The individual members are defined by their dominant element in the A, C2+ and W position.
Age distribution
Recorded ages:
Mesoproterozoic to Paleogene : 1456 Ma to 31.7 ± 0.7 Ma - based on 21 recorded ages.
Sample ages:
| Sample ID | Recorded age | Geologic Time | Dating method |
|---|---|---|---|
| 1 | 31.7 ± 0.7 Ma | Oligocene | K-Ar |
| 2 | 80.1 ± 3.1 Ma | Late/Upper Cretaceous | K-Ar |
| 3 | 226 ± 1.1 Ma | Late/Upper Triassic | K-Ar |
| 4 | 319 ± 8 Ma | Pennsylvanian | Ar-Ar |
| 5 | 430 ± 12 Ma | Wenlock | K-Ar |
| 6 | 1456 to 1359 Ma | Mesoproterozoic | K-Ar |
Sample references:
Chemical Analysis
Oxide wt%:
Showing 12 of 15 analyses on this page.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SiO2 | 49.33 % | 49.6 % | 53.22 % | 55.29 % | 49.48 % | 48.63 % | 51.64 % | 54.80 % | 54.25 % | 50.31 % | 51.86 % | 49.03 % |
| TiO2 | 0.40 % | 0.46 % | 0.37 % | 1.86 % | 0.47 % | 0.43 % | 0.74 % | 0.15 % | 1.08 % | 0.57 % | 0.38 % | 0.73 % |
| Al2O3 | 0.72 % | 1.22 % | 2.31 % | 0.21 % | 0.89 % | 0.58 % | 0.58 % | 0.17 % | 0.03 % | 0.63 % | 1.50 % | 0.87 % |
| Fe2O3 | 1.55 % | 3.77 % | 2.26 % | 11.60 % | 4.74 % | 9.84 % | 8.07 % | 12.00 % | 13.98 % | 14.51 % | ||
| FeO | 30.95 % | 33.0 % | 14.01 % | 10.52 % | 31.58 % | 24.69 % | 17.53 % | 2.61 % | 6.69 % | 22.14 % | 5.11 % | 13.70 % |
| MnO | 2.15 % | 0.86 % | 0.05 % | 0.25 % | 2.04 % | 1.37 % | 0.88 % | 0.11 % | 0.32 % | 0.77 % | 4.35 % | 5.46 % |
| MgO | 0.74 % | 0.17 % | 15.56 % | 14.02 % | 0.70 % | 0.04 % | 7.79 % | 17.44 % | 13.99 % | 8.85 % | 0.61 % | |
| CaO | 1.01 % | 0.39 % | 2.00 % | 2.56 % | 1.02 % | 0.30 % | 1.63 % | 2.37 % | 1.16 % | 3.07 % | 0.05 % | |
| Na2O | 7.07 % | 8.7 % | 8.34 % | 7.74 % | 6.93 % | 7.01 % | 6.94 % | 6.37 % | 6.33 % | 8.82 % | 7.13 % | 8.95 % |
| K2O | 1.81 % | 2.33 % | 0.56 % | 2 % | 1.97 % | 3.29 % | 3.41 % | 3.44 % | 5.20 % | 1.58 % | 1.10 % | 1.29 % |
| ZrO2 | 0.20 % | 0.02 % | ||||||||||
| Cl | 0.01 % | 0.01 % | ||||||||||
| F | 0.64 % | 0.81 % | 1.43 % | 0.36 % | 1.59 % | 2.33 % | 2.20 % | 2.31 % | 2.43 % | 2.85 % | ||
| Li2O | 0.05 % | 0.45 % | 0.76 % | 0.27 % | 0.6 % | |||||||
| H2O | 1.21 % | 1.7 % | 1.20 % | (0.82) % | ||||||||
| O=F | -0.6 % | -0.15 % | -0.67 % | -0.97 % | -1.02 % | -1.20 % | ||||||
| ZnO | 0.20 % | 0.06 % | 0.05 % | 0.49 % | 0.14 % | 0.90 % | ||||||
| Cr2O3 | 0.07 % | |||||||||||
| Total: | 95.93 % | 97.4 % | 97.24 % | 100.31 % | 97.34 % | 100.5 % | 98.06 % | 99.7 % | 99.37 % | 99.41 % | 99.15 % | 98.35 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 2 | (Na0.62K0.47) 1.09 (Na1.93Ca0.07) 2.00 (Fe2+3.43Mg0.04Fe3+0.97Mn0.12Ti0.06Al0.15Zr0.01) 4.78(Si7.92 Al0.08) 8.00 O22[ (OH) 1.97 F0.03] 2.00 |
| 13 | (Na0,71K0,301) 1,011 (Na1,618Ca0,382) 2 (Fe2+3,869Fe3+0,664Ti0,27Mn0,115Al0,072) 4,99 (Si7,891Al0,109) 8O22 ((OH) 1,458O0,542) 2 |
| 4 | (Na0.569K0.369)0.938 (Na1.603Ca0.397)2(Mg3.025Feii1.273FeIII0.411Ti0.202Al0.036Mnii0.031Li0.029)5.007Si8.002O22 ((OH)1,168F0,655O0.168)2 |
| 6 | (K0.67Na0.22) 0.89(Na1.95Ca0.05) 2.00 (Fe2+ 3.29Fe3+ 1.26Li0.29Mn0.19Ti0.05Zn0.02Mg0.01) 5.11(Si7.76Fe3+ 0.13Al0.11) 8.00 O22[(OH) 1.81F0.18] 1.99 |
| 14 | (K0.73Na0.27) 1.00 (Na2.00Ca0.01) 2.01 (Fe2+ 1.77 Mg1.10Fe3+ 0.98Li0.45Mn0.42Ti0.09Zn0.01 Al0.09) 4.91Si8.09O22[(OH) 1.41F0.59] 2.00 |
| 7 | (K0.67Na0.33) 1.00 (Na1.74Ca0.27) 2.01 (Fe2+ 2.26 Mg1.79Fe3+ 0.55Mn0.25Ti0.09Zn0.01 Al0.05) 5.00(Si7.94 Al0.06) 8.00O22[(OH) 1.23F0.77] 2.00 |
| 8 | (K0.63 Na0.15) 0.78 (Na1.62Ca0.36Mn0.02) 2.00 (Mg3.72 Fe2+ 0.31 Fe3+ 0.95Mn0.00Ti0.02Al0.00) 5.00(Si7.85Al0.03 Fe3+ 0.11Cr0.01) 8.00O22[F1.06(OH) 0.94]2.00 |
| 9 | K0.98 (Na1.81Ca0.18) 1.99 (Mg3.07 Fe2+ 0.83 Fe3+ 0.90Mn0.04Ti0.12Zn0.01 Al0.01) 4.98Si8.00)O22[F1.03(OH) 0.73O 0.24] 2.00 |
| 10 | (K0.32Na0.68)Na2(Li0.48Fe2.83Mn0.1Zn0.06Fe1.46Ti0.07)(Si7.88Al0.12)O22(F1.15OH0.85) |
| 15 | (K0.25Na0.75)Na2(Li0.48Fe2.84Mn0.11Zn0.05Fe1.45Ti0.07)(Si7.89Al0.11)O22(F1.35OH0.65) |
| 11 | A(Na0.526K0.207)B0.733( (Na1.514Ca0.485Mn0.072) C2.00( (Mg2.057Li0.160Fe2+0.631Mn2+0.544Zn0.015Fe3+1.552Ti0.042) 5.001 T( (Si7.652Al0.261) 7.913OW22( (F1.143(OH) 0.857) 2.00 |
| 12 | A(Na0.767K0.261)B1.028( (Na1.990Ca0.010)C2.00( (Mg0.144Li0.383Fe2+1.818Mn2+0.734Fe3+1.733Ti0.087) 5.004 T( (Si7.780Al0.163) 7.943OW22( (F1.448(OH) 0.552) 2.00 |
Sample references:
| ID | Type | Locality | Reference | Notes |
|---|---|---|---|---|
| 1 | Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland | Sample from an alkali-rich syenite. | ||
| 2 | ILM42 | Ilímaussaq complex, Kujalleq, Greenland | The sample was collected from ilvaite bearing endoskarns formed by late-magmatic to hydrothermal veins on the south coast of the Tunulliarfik fjord. Mineral compositions were analyzed using a JEOL 8900 electron microprobe | |
| 3 | Mud Tank Vermiculite Mine, Alcoota Station, Central Desert Region, Northern Territory, Australia | Average of 6 analyses. Sample taken from a silicate rich carbonatite. | ||
| 4 | 760 | Coyote Peak, Humboldt County, California, USA | Analyzed by single crystal X-ray and electron- and ion-microprobe techniques. The sample is also analyzed for Li and H. | |
| 5 | Motzfeldt Centre, Igaliku Complex, Kujalleq, Greenland | Sample from an alkali-rich syenite. | ||
| 6 | Type Specimen | Potassic-Arfvedsonite occurrence, Pegmatite Valley, Lilleelv, Head of Kangerluarsuk, Kangerluarsuk Fjord, Ilímaussaq complex, Kujalleq, Greenland | Pekov, I.V., Chukanov, N.V., Lebedeva, Yu. S., Pushcharovsky, D. Yu., Ferraris, G., Gula, A., Zadov, A.E., Novakova, A.A., Petersen, O.V. (2004) Potassicarfvedsonite, KNa2 Fe2+4Fe3+Si8O22(OH)2, a K-dominant amphibole of the arfvedsonite series from agpaitic pegmatites – Mineral data, structure refinement and disorder in the A site. Neues Jahrbuch für Mineralogie - Monatshefte, 2004 (12) 555-574 doi:10.1127/0028-3649/2004/2004-0555 | The chemical composition of potassicarfvedsonite was obtained (fluorine and cations except Li) by a Camebax SX50 electron microprobe. Li was determined by atom emission using a Carl Zeiss AAS30 spectrophotometer. The water content was determined by the Alimarin method, a modified Penfield, with water absorption by Mg(ClO4)2. The Fe2+/ Fe3+ ratio was determined via Mössbauer spectroscopy. Single-crystal diffraction data were collected at room temperature using a Nonius Kappa CCD diffractometer. X-ray powder diffraction data were obtained using a DRON UM-1 diffractometer and Fe-filtered CoKα-radiation |
| 7 | Hilairitovoye pegmatite, 252 m level, Kirovskii apatite mine, Kukisvumchorr Mt, Murmansk Oblast, Russia | Pekov, I.V., Chukanov, N.V., Lebedeva, Yu. S., Pushcharovsky, D. Yu., Ferraris, G., Gula, A., Zadov, A.E., Novakova, A.A., Petersen, O.V. (2004) Potassicarfvedsonite, KNa2 Fe2+4Fe3+Si8O22(OH)2, a K-dominant amphibole of the arfvedsonite series from agpaitic pegmatites – Mineral data, structure refinement and disorder in the A site. Neues Jahrbuch für Mineralogie - Monatshefte, 2004 (12) 555-574 doi:10.1127/0028-3649/2004/2004-0555 | The chemical composition of potassicarfvedsonite was obtained (fluorine and cations except Li) by a Camebax SX50 electron microprobe. Li was determined by atom emission using a Carl Zeiss AAS30 spectrophotometer. The water content calculated The Fe2+/ Fe3+ ratio was calculated. | |
| 8 | Type Specimen | Highway 366 roadcut, Val-des-Monts, Les Collines-de-l'Outaouais RCM, Outaouais, Québec, Canada | The sample were analyzed at Virginia Polytechnic Institute by wavelength dispersion, using a 9-channel ARL - SEMQ microprobe.Fe2+/Fe3+ ratio were found by by Mossbauer spectroscopy. The cell parameters were determined from single-crystal X-ray powder-diffraction data. | |
| 9 | AS04-36 | Monte Metocha, Xixano, Montepuez District, Cabo Delgado Province, Mozambique | Oberti, R., Boiocchi, M., Hawthorne, F. C., Robinson, P. (2010) Crystal structure and crystal chemistry of fluoro-potassic-magnesio-arfvedsonite from Monte Metocha, Xixano region, Mozambique, and discussion of the holotype from Quebec, Canada. Mineralogical Magazine, 74 (6) 951-960 doi:10.1180/minmag.2010.074.6.951 | The sample was analyzed by electron microprobe using a Cameca SX-100 operating in wavelength-dispersive mode. The powder-diffraction pattern was recorded from a small fragment on a 114.6 mm Debye-Scherrer powder camera with a Gandolfi attachment and Ni-filtered Cu-Ka X-radiation The Fe2+-Fe3+ ratio and the H2O content were derived from the results of crystal-structure refinement. The oxo component (O2 at the O(3) site) was estimated based on the Ti content. |
| 10 | H1 | Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA | Chemical and structural analysis including site assignments. See reference for details. | |
| 11 | 830C30-5 | Virgin Canyon pluton, Questa, Taos County, New Mexico, USA | A single crystal about 0.2x2mm was analyzed with EMPA, XRD and site scattering techniques. Li is ordered at M3, which is compensated by Fe3+ in the M2 site. The sample is named magesio-ferri-fluoro-katophorite in the references, but as #B#Na>1.5 and M#3+# > 1,5, the composition corresponds to fluoro-arfvedsonite. | |
| 12 | Q83J70-3 | " " | A single crystal about 0.2x2mm was analyzed with EMPA, XRD and site scattering techniques. Li is ordered at M3, which is compensated by Fe3+ in the M2 site. | |
| 13 | Mount Rittmann, Victoria Land, East Antarctica, Antarctica | Representative sample of amphibole from the groundmass of hyperalkaline volcanic rocks. The analysis was performed with an EDAX system mmounted on a Electronic Micropscope Phillips SEM-500. Analysis is normalized using Locock (2014) | ||
| 14 | Palitra pegmatite, Karnasurt mine, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia | Pekov, I.V., Chukanov, N.V., Lebedeva, Yu. S., Pushcharovsky, D. Yu., Ferraris, G., Gula, A., Zadov, A.E., Novakova, A.A., Petersen, O.V. (2004) Potassicarfvedsonite, KNa2 Fe2+4Fe3+Si8O22(OH)2, a K-dominant amphibole of the arfvedsonite series from agpaitic pegmatites – Mineral data, structure refinement and disorder in the A site. Neues Jahrbuch für Mineralogie - Monatshefte, 2004 (12) 555-574 doi:10.1127/0028-3649/2004/2004-0555 | The chemical composition of potassicarfvedsonite was obtained (fluorine and cations except Li) by a Camebax SX50 electron microprobe. Li was determined by atom emission using a Carl Zeiss AAS30 spectrophotometer. The water content calculated The Fe2+/ Fe3+ ratio was calculated. | |
| 15 | H2 | Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA | Chemical and structural analysis including site assignments. See reference for details. |
Crystallography of Arfvedsonite Root Name Group
Crystal System:
Monoclinic
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020742 | Magnesio-arfvedsonite | Oberti R, Boiocchi M, Hawthorne F C, Ball N A, Harlow G E (2015) Magnesio-arfvedsonite from Jade mine tract, Myanmar: mineral description and crystal chemistry Mineralogical Magazine 79 253-260 | 2015 | Jade mine tract, Myanmar | 0 | 293 | |
| 0001597 | Arfvedsonite | Hawthorne F C, Ungaretti L, Oberti R, Bottazzi P, Czamanske G K (1993) Li: an important component in igneous alkali amphiboles American Mineralogist 78 733-745 |  | 1993 | Questa caldera, New Mexico | 0 | 293 |
| 0001598 | Arfvedsonite | Hawthorne F C, Ungaretti L, Oberti R, Bottazzi P, Czamanske G K (1993) Li: an important component in igneous alkali amphiboles American Mineralogist 78 733-745 | | 1993 | 0 | 293 | |
| 0007427 | Magnesio-arfvedsonite | Ghose S, Kersten M, Langer K, Rossi G, Ungaretti L (1986) Crystal field spectra and Jahn Teller effect of Mn3+ in clinopyroxene and clinoamphiboles from India Physics and Chemistry of Minerals 13 291-305 | 1986 | 0 | 293 | ||
| 0005126 | Arfvedsonite | Hawthorne F C (1976) The crystal chemistry of the amphiboles: V. The structure and chemistry of arfvedsonite The Canadian Mineralogist 14 346-356 | | 1976 | 0 | 293 |
CIF Raw Data - click here to close
Relationship of Arfvedsonite Root Name Group to other Species
Other Members of Sodium Amphibole Subgroup:
| Eckermannite Root Name Group | ANa2(C2+4Al}Si8O22W2 | Mon. |
| Glaucophane Root Name Group | ◻Na2(C2+3Al2)Si8O22W2 | Mon. |
| Leakeite Root Name Group | ANa2(C2+2C3+2Li)(Si8O22)W2 | |
| Nybøite Root Name Group | ANa2(C2+3C3+2)(AlSi7O22)W2 | |
| Riebeckite Root Name Group | ◻Na2(C2+3Fe3+2)(Si8O22)W2 | Mon. |
Arfvedsonite Root Name Group Members:
| Arfvedsonite | NaNa2(Fe2+4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 'Fluoro-arfvedsonite' | NaNa2(Fe2+4Fe3+)Si8O22F2 | |
| Magnesio-arfvedsonite | NaNa2(Mg4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Magnesio-fluoro-arfvedsonite | NaNa2(Mg4Fe3+)[Si8O22]F2 | Mon. 2/m : B2/m |
| Potassic-arfvedsonite | KNa2(Fe2+4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Potassic-magnesio-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| Potassic-magnesio-fluoro-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)F2 | Mon. 2/m : B2/m |
Click on any node to view relationships. Formula-derived relationship network for the group members above. Use Find related species to add formula-neighbour species outside the current group view. Solid links show inferred chemical differences; dashed violet links show same-formula crystallographic differences. Hydration states are not treated as relationship changes. These relationships do not imply any real-world substitution reactions between these species.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Arfvedsonite Root Name Group in petrology
An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Arfvedsonite Root Name Group
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Hurricane Mountain localities, North Conway, Conway, Carroll County, New Hampshire, USA