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Chivruaiite

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Formula:
Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
Colour:
Pale pink to colourless
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
2.4
Crystal System:
Orthorhombic
Member of:
Name:
For the type locality, the Chivruai River Valley, Lovozero Massif, Kola Peninsula, Russia.
The structure of Chivruaiite contains double dreier chains of (SiO4) tetrahedra, which are linked by Ti cations into a three-dimensional framework. A topologically identical framework is found in the structures of Haineaultite, Zorite, and the synthetic Zorite analogue ETS-4 (Men'shikov et al., 2006).


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Classification of ChivruaiiteHide

Approved
Approval Year:
2004
9.DG.45

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains

Physical Properties of ChivruaiiteHide

Vitreous
Transparency:
Transparent
Colour:
Pale pink to colourless
Streak:
White
Hardness:
Cleavage:
Distinct/Good
on {100} and {010}
Fracture:
Step-Like
Density:
2.4 g/cm3 (Measured)    2.42 g/cm3 (Calculated)

Optical Data of ChivruaiiteHide

Type:
Biaxial (+)
RI values:
nα = 1.705 nβ = 1.627 nγ = 1.612
2V:
Measured: 35° to 45°, Calculated: 31°
Max Birefringence:
δ = 0.093
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v
Pleochroism:
Weak
Comments:
X = b
Y = a
Z = c

Z: pale-pink, X and Y: colourless

Chemical Properties of ChivruaiiteHide

Formula:
Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O

Crystallography of ChivruaiiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmmm
Cell Parameters:
a = 7.17 Å, b = 22.98 Å, c = 6.94 Å
Ratio:
a:b:c = 0.312 : 1 : 0.302
Unit Cell V:
1144.4 ų
Z:
1
Morphology:
Dominant faces: {100}, {010}, {001}, {101}, and {011}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.6 (100)
6.91 (90)
5.23 (50)
3.41 (50)
3.35 (50)
3.04 (80)
Comments:
Format: d/Å (I/%) (hkl), from type description

Type Occurrence of ChivruaiiteHide

General Appearance of Type Material:
elongate-prismatic crystals up to 3 mm long, as well as radiating aggregates
Place of Conservation of Type Material:
Geological and Mineralogical Museum of the Geological Institute of the Kola Science Centre of Russian Academy of Sciences, Apatity, Russia (co-type); Mineralogical Museum of St. Petersburg State University (holotype).
Geological Setting of Type Material:
Microcline vein in eudialyte-bearing lujavrite; astrophyllite-aegirine-microcline hydrothermal veins in foyaite within nepheline syenite in alkaline massifs.
Associated Minerals at Type Locality:

Synonyms of ChivruaiiteHide

Other Language Names for ChivruaiiteHide

Relationship of Chivruaiite to other SpeciesHide

Member of:
Other Members of this group:
Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
XonotliteCa6(Si6O17)(OH)2Mon. 2/m
ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.

Related Minerals - Nickel-Strunz GroupingHide

9.DG.05BustamiteCaMn2+(Si2O6)Tric. 1 : P1
9.DG.05FerrobustamiteCaFe2+(Si2O6)Tric.
9.DG.05PectoliteNaCa2Si3O8(OH)Tric. 1 : P1
9.DG.05SeranditeNaMn2+2Si3O8(OH)Tric. 1 : P1
9.DG.05WollastoniteCaSiO3Tric. 1 : P1
9.DG.05Wollastonite-1ACaSiO3Tric.
9.DG.07CascanditeCa(Sc,Fe3+)(HSi3O9)Tric.
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
9.DG.10Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
9.DG.15FoshagiteCa4(Si3O9)(OH)2Tric.
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2OTric.
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2OOrth.
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2OOrth.
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
9.DG.35XonotliteCa6(Si6O17)(OH)2Mon. 2/m
9.DG.40HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2OOrth. 2 2 2 : C2 2 2
9.DG.55EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
9.DG.60EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2OOrth.
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)Tric.
9.DG.70LitidioniteCuNaKSi4O10Tric.
9.DG.70ManaksiteKNaMnSi4O10Tric.
9.DG.75TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]Tric.
9.DG.75TokkoiteK2Ca4[Si7O18(OH)](OH,F)Tric.
9.DG.75SenkevichiteCsKNaCa2Ti[O|Si7O18(OH)]Tric. 1 : P1
9.DG.80CanasiteK3Na3Ca5Si12O30(OH)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2OMon. m : Bm
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2OTric.
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2OTric.
9.DG.92Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2OMon. 2/m : P21/m
9.DG.95YuksporiteK4(Ca,Na)14(Sr,Ba)2(◻,Mn,Fe)(Ti,Nb)4(O,OH)4(Si6O17)2(Si2O7)3(H2O,OH)3Orth.
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14Mon. 2/m : P2/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 ChivruaiiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Men'shikov, Y.P., Krivovichev, S.V., Pakhomovsky, Y.A., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Armbruster, T., and Selivanova, E.A. (2006): Chivruaiite, Ca4(Ti,Nb)5[(Si6O17)2|(OH,O)5]·13-–14H2O, a new mineral from hydrothermal veins of Khibiny and Lovozero alkaline massifs. American Mineralogist 91, 922-928.

Internet Links for ChivruaiiteHide

Localities for ChivruaiiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
Men'skikov, Y.P. et al (2006), American Mineralogist: 91: 922-928.; Yakovenchik, V.N., Ivaniuk, G.Yu., Pakhomovsky, Ya.A., Selivanova, E.A., Men'shikov, Yu.P., Korchak, J.A., Krivovichev, S.V., Spiridonova, D.V., Zalkind, O.A. (2010): Punkaruaivite, Li{Ti2(OH)2[Si4O11(OH)]}•H2O, a new mineral species from hydrothermalites of Khibiny and Lovozero alkaline massifs (Kola Peninsula, Russia). Canadian Mineralogist, 48, 41-50.
Men'shikov, Y.P., Krivovichev, S.V., Pakhomovsky, Y.A., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Armbruster, T., and Selivanova, E.A. (2006): Chivruaiite, Ca4(Ti,Nb)5[(Si6O17)2|(OH,O)5]·13-–14H2O, a new mineral from hydrothermal veins of Khibiny and Lovozero alkaline massifs. American Mineralogist 91, 922-928.
Men'shikov, Y.P., Krivovichev, S.V., Pakhomovsky, Y.A., Yakovenchuk, V.N., Ivanyuk, G.Y., Mikhailova, J.A., Armbruster, T., and Selivanova, E.A. (2006): Chivruaiite, Ca4(Ti,Nb)5[(Si6O17)2|(OH,O)5]·13-–14H2O, a new mineral from hydrothermal veins of Khibiny and Lovozero alkaline massifs. American Mineralogist 91, 922-928.
      • Lovozero Massif
Y. P. Men'shikov et al.: Am. Min. 91:922-928 (2006)
Mineral and/or Locality  
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