Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportAdd Glossary Item
StatisticsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Chivruaiite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
System:
Orthorhombic
Colour:
Pale pink to colourless
Hardness:
3
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).

Classification of Chivruaiite

Approved 2004
9.DG.45

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains
mindat.org URL:
http://www.mindat.org/min-27495.html
Please feel free to link to this page.

First Recorded Occurrence of Chivruaiite

General Appearance of First Recorded Material:
elongate-prismatic crystals up to 3 mm long, as well as radiating aggregates
Place of Conservation of First Recorded 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).
Year of Discovery:
1978
Geological Setting of First Recorded Material:
Microcline vein in eudialyte-bearing lujavrite; astrophyllite-aegirine-microcline hydrothermal veins in foyaite within nepheline syenite in alkaline massifs.
Associated Minerals at First Recorded Locality:

Physical Properties of Chivruaiite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Pale pink to colourless
Streak:
White
Hardness (Mohs):
3
Cleavage:
Distinct/Good
on {100} and {010}
Fracture:
Step-Like
Density:
2.4 g/cm3 (Measured)    2.42 g/cm3 (Calculated)

Crystallography of Chivruaiite

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

Optical Data of Chivruaiite

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 Chivruaiite

Formula:
Ca4(Ti,Nb)5(Si6O17)2(OH,O)5 · 13-14H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Mean chemical composition determined by electron microprobe analysis (EMPA)
SiO2 (45.14)
TiO2 (20.63)
Al2O3 (0.07)
Fe2O3 (0.18)
MnO (0.02)
MgO (0.01) 
CaO (10.53)
Na2O (0.10)
K2O (1.30)
SrO (0.28)
Nb2O5 (3.63)
H2O (17.30)

sum 99.19 wt-%

Relationship of Chivruaiite to other Species

Member of:
Other Members of Group:
Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O
XonotliteCa6(Si6O17)(OH)2
ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
9.DG.05BustamiteCaMn2+(Si2O6)
9.DG.05FerrobustamiteCaFe2+(Si2O6)
9.DG.05PectoliteNaCa2(HSi3O9)
9.DG.05SéranditeNa(Mn2+,Ca)2(HSi3O9)
9.DG.05WollastoniteCaSiO3
9.DG.05Wollastonite-1ACaSiO3
9.DG.07CascanditeCa(Sc,Fe3+)(HSi3O9)
9.DG.08Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)
9.DG.10Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.10RiversideiteCa5(HSi3O9)2 · 2H2O
9.DG.10Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
9.DG.15FoshagiteCa4(Si3O9)(OH)2
9.DG.20JenniteCa9(Si3O9)2(OH)8 · 8H2O
9.DG.25ParaumbiteK3Zr2H(Si3O9)2 · nH2O
9.DG.25UmbiteK2(Zr,Ti)Si3O9 · H2O
9.DG.30SørenseniteNa4SnBe2Si6O16(OH)4
9.DG.35XonotliteCa6(Si6O17)(OH)2
9.DG.40HillebranditeCa2(SiO3)(OH)2
9.DG.45ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
9.DG.50Haineaultite(Na,Ca)5Ca(Ti,Nb)5(Si6O17)2(OH,F)8 · 5H2O
9.DG.55EpididymiteNa2Be2Si6O15 · H2O
9.DG.60EudidymiteNa2Be2Si6O15 · H2O
9.DG.65ElpiditeNa2ZrSi6O15 · 3H2O
9.DG.70Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
9.DG.70LitidioniteCuNaKSi4O10
9.DG.70ManaksiteKNaMnSi4O10
9.DG.75TinaksiteK2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)]
9.DG.75TokkoiteK2Ca4Si7O17(O,OH,F)4
9.DG.75SenkevichiteCsKNaCa2Ti[O|Si7O18(OH)]
9.DG.80CanasiteK2Na4Ca5(Si12O30(OH,F)4
9.DG.80FluorcanasiteK3Na3Ca5Si12O30F4 · H2O
9.DG.85MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O
9.DG.90FrankameniteK3Na3Ca5(Si12O30)(F,OH)4 · H2O
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 · ~3H2O
9.DG.95Yuksporite(K,Ba)NaCa2(Si,Ti)4O11(F,OH) · H2O
9.DG.97Eveslogite(Na,K,Ca,Sr,Ba)48 [(Ti,Nb,Mn,Fe2+)12Si48O144(OH)12](F,OH,Cl)14

Other Names for Chivruaiite

Name in Other Languages:

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 Chivruaiite

Reference List:
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 Chivruaiite

Localities for Chivruaiite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
Men'skikov, Y.P. et al (2006), American Mineralogist: 91: 922-928.
        • Lovozero Massif
Y. P. Men'shikov et al.: Am. Min. 91:922-928 (2006)
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2015, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: April 19, 2015 12:07:15 Page generated: April 14, 2015 21:38:44