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w(O)-dominant Amphibole Group

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Formula:
{A0-1}{X2}{Z5}(T8O22)O2
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 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.

Classification of w(O)-dominant Amphibole Group

Approved 2012
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Chemical Properties of w(O)-dominant Amphibole Group

Formula:
{A0-1}{X2}{Z5}(T8O22)O2

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:
w(OH, F, Cl)-dominant Amphibole Group{A0-1}{X2}{Z5}(T8O22)(OH,F,Cl)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
Oxo-magnesio-hastingsite NaCa2(Mg2Fe33+ )(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.

References for w(O)-dominant Amphibole Group

Reference List:
Frank C. Hawthorne, Roberta Oberti, George E. Harlow, Walter V. Maresch, Robert F. Martin, John C. Schumacer, Mark D. Welch (2012): Nomenclature of the amphibole supergroup, American Mineralogist, Volume 97, pages 2031–2048

Internet Links for w(O)-dominant Amphibole Group

Localities for w(O)-dominant Amphibole Group

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