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Arfvedsonite Root Name

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About Arfvedsonite Root NameHide

Formula:
ANa2(Z2+4Fe3+}Si8O22(OH,F,Cl)2
The arfvedsonite minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < Z(Al+Fe3++2Ti) < 1.5 apfu with Fe3+ as the dominant element in the Z3+ position (= IMA C3+ position). The individual members are defined by their dominant element in the A, Z2+(= IMA C2+) and W position.

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.
Crystal System:
Monoclinic
Name:
Named for Johan A. Arfvedson (Arfwedson) (1792-1841), Swedish chemist.
This page provides mineralogical data about Arfvedsonite Root Name.


Chemical Properties of Arfvedsonite Root NameHide

Formula:
ANa2(Z2+4Fe3+}Si8O22(OH,F,Cl)2

The arfvedsonite minerals are sodium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 0.5 apfu < Z(Al+Fe3++2Ti) < 1.5 apfu with Fe3+ as the dominant element in the Z3+ position (= IMA C3+ position). The individual members are defined by their dominant element in the A, Z2+(= IMA C2+) and W position.

On mindat.org we avoid using variables with the same symbol as elements and deviate from the IMA nomenclaure in that we use X rather than B, Z rather than C and (OH,F,Cl,O) rather than W.

Crystallography of Arfvedsonite Root NameHide

Crystal System:
Monoclinic

Relationship of Arfvedsonite Root Name to other SpeciesHide

Other Members of this group:
Eckermannite Root NameANa2(Z2+4Al}Si8O22(OH,F,Cl)2Mon.
Glaucophane Root Name◻[Na2][Z2+3Al2]Si8O22(OH,F,Cl)2Mon.
Leakeite Root NameANa2(Z2+2Z3+2Li)(Si8O22)(OH,F,Cl)2
Nybøite Root NameANa2(Z2+3Z3+2)(AlSi7O22)(OH,F,Cl)2
Riebeckite Root Name◻[Na2][Z2+3Fe3+2]Si8O22(OH,F,Cl)2Mon.
Group Members:
Arfvedsonite [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
Fluoro-arfvedsonite [Na][Na2][Fe2+4Fe3+]Si8O22F2
Magnesio-arfvedsonite {Na}{Na2}{Mg4Fe3+}(Si8O22)(OH)2Mon. 2/m : B2/m
Magnesio-fluoro-arfvedsonite [Na][Na2][Mg4Fe3+][Si8O22](F,OH)2Mon.
Potassic-arfvedsonite [(K,Na)][Na2][Fe2+4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
Potassic-magnesio-arfvedsonite [K][Na2][Mg4Fe3+]Si8O22(OH)2Mon. 2/m : B2/m
Potassic-magnesio-fluoro-arfvedsonite [(K,Na)][Na2][Mg4Fe3+][Si8O22][(F,OH)2]

Other InformationHide

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 in petrologyHide

References for Arfvedsonite Root NameHide

Reference List:
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Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Arfvedsonite Root NameHide

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