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Potassic-ferro-taramite

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Formula:
K{CaNa}{Fe2+3Al2}{Si6Al2}O22(OH)2
The taramite group minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).

Potassic-ferro-taramite is defined with

A position: K dominant
C2+ position: Fe dominant
C3+ position: Al dominant
W position: (OH) dominant
Colour:
Dark bluish-green
Lustre:
Vitreous
Hardness:
5 - 6
Crystal System:
Monoclinic
Name:
Named for the group type locality, Walitarama, Mariupol, Ukraine.

This mineral was originally named potassic-aluminotaramite. Due to the redefinition of the taramite group in the 2012 amphibole nomenclature, the valid name for this material is potassic-ferro-taramite.
The taramite group is in the 2012 nomenclature defined with C(Al+Fe3++2Ti)>1,5 apfu, whereas the pre-2012 definition was used the T position, i.e 5,5 < Si < 6,5 apfu. This redefinition does not change the formula, but some amphiboles qualifying as potassic-ferro-taramite pre-2012 may now be potassic-ferro-katophorite.


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Classification of Potassic-ferro-taramiteHide

Approved
Approval Year:
2007

Physical Properties of Potassic-ferro-taramiteHide

Vitreous
Colour:
Dark bluish-green
Streak:
White
Hardness:
5 - 6 on Mohs scale
Cleavage:
Perfect
{110} Perfect

Chemical Properties of Potassic-ferro-taramiteHide

Formula:
K{CaNa}{Fe2+3Al2}{Si6Al2}O22(OH)2

The taramite group minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).

Potassic-ferro-taramite is defined with

A position: K dominant
C2+ position: Fe dominant
C3+ position: Al dominant
W position: (OH) dominant
IMA Formula:
K(NaCa)(Fe2+3Al2)(Si6Al2)O22(OH)2

Crystallography of Potassic-ferro-taramiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.8505 Å, b = 18.0075 Å, c = 5.3518 Å
β = 104.775°
Ratio:
a:b:c = 0.547 : 1 : 0.297
Unit Cell V:
917.93 ų (Calculated from Unit Cell)
Morphology:
Prismatic

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0007271Potassic-ferro-taramiteOberti R, Boiocchi M, Smith D C, Medenbach O, Helmers H (2008) Potassic-aluminotaramite from Sierra de los Filabres, Spain European Journal of Mineralogy 20 1005-10102008Sierra de los Filabres, Spain0293
CIF Raw Data - click here to close

Type Occurrence of Potassic-ferro-taramiteHide

Geological Setting of Type Material:
meta-monzonite
Associated Minerals at Type Locality:

Synonyms of Potassic-ferro-taramiteHide

Other Language Names for Potassic-ferro-taramiteHide

Relationship of Potassic-ferro-taramite to other SpeciesHide

Other Members of this group:
Ferri-fluoro-taramiteNa(CaNa)(Mg3Fe3+2)(Al2Si6O22)F2
Ferri-taramiteNa(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2Mon.
Ferro-ferri-fluoro-taramiteNa(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)F2
Ferro-ferri-taramiteNa(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2
Ferro-fluoro-taramiteNa(CaNa)(Fe2+3Al2)(Al2Si6O22)F2
Ferro-taramiteNa(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2Mon. 2/m : B2/m
Fluoro-taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)F2Mon. 2/m : B2/m
Potassic-ferri-taramiteK(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)
Potassic-ferro-ferri-taramiteK(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2Mon. 2/m
Taramite{Na}{CaNa}{Mg3Al2}(Al2Si6O22)(OH)2Mon. 2/m : B2/m

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.

References for Potassic-ferro-taramiteHide

Reference List:
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Obertii, R., Boiocchi, M., Smith, D.C., Mendenbach, O., Helmers H. (2008) Potassic-aluminotaramite from Sierra de los Filabres, Spain. European Journal of Mineralogy: 20: 1005–1010.
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 Potassic-ferro-taramiteHide

Localities for Potassic-ferro-taramiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Spain (TL)
 
  • Andalusia
    • Almería
Obertii, R., Boiocchi, M., Smith, D.C. Mendenbach, O. & Helmers H. (2008): Potassic-aluminotaramite from Sierra de los Filabres, Spain. European Journal of Mineralogy. 20: 1005–1010
 
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