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w(O)-dominant Amphibole Group

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The W(O)-dominant Amphibole Group is defined with WO > 1 apfu.
The W(O)-dominant Amphibole Group belongs to the amphibole supergroup and contains the amphibole minerals with WO2- > W((OH)+F+Cl)2-.

The additional charge in the W position compared with the amphiboles in the W(OH,F,Cl)-dominant Amphibole Group is accompanied by the occurrence of additional high-charge (≥3+) Z-cations (= IMA C cations) ordered at the M(1) and/or M(3) sites; the aggregate charge at Z position (=IMA C position) may thus exceed 12+.

Any W(O)-dominant amphibole corresponding to a (OH) dominant root name will be named with an oxo-prefix.

On 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.

Classification of w(O)-dominant Amphibole Group

Group Name
First Published:

Chemical Properties of w(O)-dominant Amphibole Group


The W(O)-dominant Amphibole Group is defined with WO > 1 apfu.

Relationship of w(O)-dominant Amphibole Group to other Species

Other Members of Group:
Clino-suenoite□Mn22+ Mg5Si8O22(OH)2
Unnamed (F-dominant analogue of Ferri-kaersutite)(Na,K)Ca2[Mg3(Fe3+,Fe2+)Ti](Si6Al2O22)(F,O)2
Group Members:
Kaersutite Root Name {A}{Ca2}{Z32+Z3+Ti}(Al2Si6O22)O2
  Ferri-kaersutite NaCa2(Mg3Fe3+Ti)(Al2Si6O22)O2
  Ferro-kaersutite {Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
  Kaersutite {Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
Mangani-dellaventuraite {Na}{Na2}{MgMn23+LiTi4+}Si8O22O2
Mangano-mangani-ungarettiite NaNa2(Mn22+Mn33+)(Si8O22)O2
Obertiite Root Name {A}{Na2}{Z32+Z3+Ti}{Si8O22}O2
  Ferri-obertiite Na(Na2)(Mg3Fe3+Ti)(Si8O22)O2
  Ferro-ferri-obertiite NaNa2(Fe32+Fe3+Ti)Si8O22O2
  Mangani-obertiite Na(Na2)(Mg3Mn3+Ti)(Si8O22)O2
  Unnamed (possible K-analogue of Ferri-obertiite) KNa2[(Mg,Fe,Na)3Fe3+(Ti,Fe)]Si8O22(O,F)2
Oxo-magnesio-hastingsite NaCa2(Mg2Fe33+)(Al2Si6)O22O2
Oxo-pargasite NaCa2(Mg2Al3)(Al2Si6)O22O2

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.

w(O)-dominant Amphibole Group in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for w(O)-dominant Amphibole Group

Reference List:
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 w(O)-dominant Amphibole Group URL:
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Localities for w(O)-dominant Amphibole Group

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