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Chivruaiite Mineral Data

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General Chivruaiite Information

Help on Chemical  Formula: Chemical Formula: Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]•13-14H2O
Help on Composition: Composition: Molecular Weight = 1,585.23 gm
   Potassium   1.09 %  K     1.31 % K2O
   Sodium      0.07 %  Na    0.10 % Na2O
   Strontium   0.22 %  Sr    0.26 % SrO
   Calcium     7.58 %  Ca   10.61 % CaO
   Titanium   12.47 %  Ti   20.81 % TiO2
   Manganese   0.03 %  Mn    0.04 % MnO
   Niobium     2.58 %  Nb    3.69 % Nb2O5
   Aluminum    0.03 %  Al    0.06 % Al2O3
   Iron        0.14 %  Fe    0.20 % Fe2O3
   Silicon    21.26 %  Si   45.48 % SiO2
   Hydrogen    1.95 %  H    17.43 % H2O
   Oxygen     52.56 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3K0.44Na0.05Sr0.04Mn2+0.01Ti4.13Nb0.44Fe3+0.04Al0.02Si12O34(OH)4.51O0.49�13.08(H2O)
Help on Environment: Environment: Found in three different hydrothermal veins within the Khibiny and Lovozero alkaline massifs associated with microcline, eudialyte, natrolite, astrophyllite, aegirine, etc. Ca-analo g of zorite.
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Chivruai river valley, Lovozero massif, Kola Peninsula, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2004-052

Chivruaiite Image

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Comments: SEM image of radiating aggregate of chivruaiite from a microcline vein in eudialyte-bearing lujavrite. (AmMin, v91, p923).
Location: Chivruai River valley, the Lovozero massif, Khibiny massif, Kola peninsula, Russia. Scale: See Image.
© American Mineralogist

Chivruaiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.312:1:0.302
Help on Cell Dimensions: Cell Dimensions: a = 7.17, b = 22.98, c = 6.94, Z = 1; V = 1,143.48 Den(Calc)= 2.30
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.6(1)(020 ), 6.91(0.9)(110,001 ), 3.04(0.8)(221,240 ),2.58(0.5), 3.35(0.5)(061,151 ), 3.41(0.5)(220 ), 5.23(0.5)(130 ), 2.97(0.4),

Physical Properties of Chivruaiite

Help on Cleavage: Cleavage: {100} Distinct, {010} Distinct
Help on Color: Color: Pale pink, Colorless.
Help on Density: Density: 2.4 - 2.42, Average = 2.41
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: wjhite

Optical Properties of Chivruaiite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.037 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2817,KPDmeas= 0.2689,KC= 0.2718
Ncalc = 1.63 - 1.66
Help on Optical Data: Optical Data: Biaxial (+), a=1.612, b=1.627, g=1.705, bire=0.0930, 2V(Calc)=50, 2V(Meas)=40. Dispersion r > v.

Calculated Properties of Chivruaiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.42 gm/cc
note: Specific Gravity of Chivruaiite =2.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEChivruaiite = 7.80 barns/electron
U=PEChivruaiite x relectron= 18.89 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 15.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Chivruaiite per GRapi unit = 6.35 (%)

Estimated Radioactivity from Chivruaiite - barely detectable


Chivruaiite Classification

Help on  Dana Class: Dana Class: (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.03)with chains P>2
  (66.03.01)P=3 Xonotlite Ca6Si6O17(OH)2 P 2/a 2/m Zorite Na6Ti5[Si12O34](O,OH)5•11(H2O) C mmm 2/m 2/m 2/m Eudidymite NaBeSi3O7(OH) C 2/c 2/m Epididymite NaBeSi3O7(OH) Pnam 2/m 2/m 2/m Yuksporite (Sr,Ba)2K4(Ca,Na)14([],Mn,Fe){(Ti,Nb)4(O,OH)4[Si6O17]2[Si2O7]3}(H2O,OH)n,n~3 P 21/m 2/m Haineaultite! (Na,Ca)5Ca(Ti,Nb)5(Si,S)12O34(OH,F)8•5(H2O) C 222 2 2 2 Chivruaiite! Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]•13-14H2O C mmm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.DG.45 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DG -Inosilicates with 3-periodic single and multiple chains
09.DG.45 Zorite Na6Ti5[Si12O34](O,OH)5•11(H2O) C mmm 2/m 2/m 2/m
09.DG.45 Chivruaiite! Ca4(Ti,Nb)5[(Si6O17)2[(OH,O)5]•13-14H2O C mmm 2/m 2/m 2/m

Other Chivruaiite Information

Help on References: References: NAME( AmMin, v91, p922) PHYS. PROP.(AmMin, v91, p922) OPTIC PROP.(AmMin, v91, p922)
Help on See Also: See Also: Links to other databases for Chivruaiite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.DG.45





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