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Chivruaiite

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Formula:
Ca
 
4
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 13-14H
 
2
O
System:OrthorhombicColour:Pale pink to colourless
Hardness:3
Member of:Xonotlite Group
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

IMA status:Approved 2004
Strunz 8th edition ID:8/F.22-17
Nickel-Strunz 10th (pending) edition ID:9.DG.45

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

Type Locality:Chivruai river valley, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
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).
Year of Discovery:1978
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:
NatroliteMicroclineEudialyteAstrophylliteAegirine

Physical Properties of Chivruaiite

Lustre: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 (measured):2.4 g/cm3
Density (calculated):2.42 g/cm3

Crystallography of Chivruaiite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Cmmm {C2/m 2/m 2/m}
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:
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°
Maximum Birefringence:δ = 0.093

Chart 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:
Ca
 
4
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 13-14H
 
2
O
Simplified for copy/paste:Ca4(Ti,Nb)5(Si6O17)2(OH,O)5·13-14H2O
Essential elements:Ca, H, O, Si, Ti
All elements listed in formula:Ca, H, Nb, O, Si, Ti
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:Xonotlite Group
Other Members of Group:

- +
Haineaultite
(Na,Ca)
 
5
Ca(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,F)
 
8
· 5H
 
2
O
Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
Zorite
Na
 
8
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 14H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
9.DG.05Bustamite
CaMn
2+
 
(Si
 
2
O
 
6
)
9.DG.05Ferrobustamite
Ca(Fe
2+
 
,Ca,Mn
2+
 
)(Si
 
2
O
 
6
)
9.DG.05Pectolite
NaCa
 
2
(HSi
 
3
O
 
9
)
9.DG.05Sérandite
Na(Mn
2+
 
,Ca)
 
2
(HSi
 
3
O
 
9
)
9.DG.05Wollastonite
CaSiO
 
3
9.DG.05Wollastonite-1A
CaSiO
 
3
9.DG.07Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)
9.DG.08Plombièrite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 7H
 
2
O
9.DG.10Clinotobermorite
Ca
 
5
(Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.10Riversideite
Ca
 
5
(HSi
 
3
O
 
9
)
 
2
· 2H
 
2
O
9.DG.10Tobermorite
Ca
 
4+x
(H
 
2-2x
Si
 
6
O
 
17
) · 5H
 
2
O
9.DG.15Foshagite
Ca
 
4
(Si
 
3
O
 
9
)(OH)
 
2
9.DG.20Jennite
Ca
 
9
(Si
 
3
O
 
9
)
 
2
(OH)
 
8
· 8H
 
2
O
9.DG.25Paraumbite
K
 
3
Zr
 
2
H(Si
 
3
O
 
9
)
 
2
· nH
 
2
O
9.DG.25Umbite
K
 
2
(Zr,Ti)Si
 
3
O
 
9
· H
 
2
O
9.DG.30Sørensenite
Na
 
4
SnBe
 
2
Si
 
6
O
 
16
(OH)
 
4
9.DG.35Xonotlite
Ca
 
6
(Si
 
6
O
 
17
)(OH)
 
2
9.DG.40Hillebrandite
Ca
 
2
(SiO
 
3
)(OH)
 
2
9.DG.45Zorite
Na
 
8
(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,O)
 
5
· 14H
 
2
O
9.DG.50Haineaultite
(Na,Ca)
 
5
Ca(Ti,Nb)
 
5
(Si
 
6
O
 
17
)
 
2
(OH,F)
 
8
· 5H
 
2
O
9.DG.55Epididymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
9.DG.60Eudidymite
Na
 
2
Be
 
2
Si
 
6
O
 
15
· H
 
2
O
9.DG.65Elpidite
Na
 
2
ZrSi
 
6
O
 
15
· 3H
 
2
O
9.DG.70Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
9.DG.70Litidionite
CuNaKSi
 
4
O
 
10
9.DG.70Manaksite
KNaMnSi
 
4
O
 
10
9.DG.75Tinaksite
K
 
2
Na(Ca,Mn
2+
 
)
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.75Tokkoite
K
 
2
Ca
 
4
Si
 
7
O
 
17
(O,OH,F)
 
4
9.DG.75Senkevichite
CsKNaCa
 
2
Ti[O|Si
 
7
O
 
18
(OH)]
9.DG.80Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
9.DG.80Fluorcanasite
K
 
3
Na
 
3
Ca
 
5
Si
 
12
O
 
30
F
 
4
· H
 
2
O
9.DG.85Miserite
K(Ca,Ce)
 
4
Si
 
5
O
 
13
(OH)
 
3
9.DG.90Frankamenite
K
 
3
Na
 
3
Ca
 
5
(Si
 
12
O
 
30
)(F,OH)
 
4
· H
 
2
O
9.DG.92Charoite
(K,Sr)
 
15-16
(Ca,Na)
 
32
[Si
 
6
O
 
11
(O,OH)
 
6
]
 
2
[Si
 
12
O
 
18
(O,OH)
 
12
]
 
2
[Si
 
17
O
 
25
(O,OH)
 
18
]
 
2
(OH,F)
 
4
· ~3H
 
2
O
9.DG.95Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH) · H
 
2
O
9.DG.97Eveslogite
(Na,K,Ca,Sr,Ba)
 
48
[(Ti,Nb,Mn,Fe
2+
 
)
 
12
Si
 
48
O
 
144
(OH)
 
12
](F,OH,Cl)
 
14

Other Names for Chivruaiite

Synonyms:
IMA2004-052
Other Languages:
Russian:Чивруайит

Other Information

Health Warning: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

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  • Localities for Chivruaiite

    (TL) indicates type locality. ? 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)
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