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Tumchaite

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About TumchaiteHide

07678360015816464706095.jpg
Tumcha River, Russia
Formula:
Na2Zr(Si4O11) · 2H2O
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
Specific Gravity:
2.78
Crystal System:
Monoclinic
Name:
Named for the Tumcha River, which passes near the type locality of Vuoriyarvi massif, North Karelia, Murmanskaja Oblast', Russia.

Classification of TumchaiteHide

Approved
Approval Year:
1999
First Published:
2000
9.EA.60

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

Physical Properties of TumchaiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless to white
Streak:
White
Hardness:
4½ on Mohs scale
Hardness:
VHN40=365 - 445 kg/mm2 - Vickers
Hardness Data:
Measured
Tenacity:
Very brittle
Cleavage:
Perfect
{100} perfect
Parting:
Not observed
Fracture:
Irregular/Uneven
Density:
2.78(2) g/cm3 (Measured)    2.77 g/cm3 (Calculated)
Comment:
Flotation, using a dilute Clerici-H2O solution

Optical Data of TumchaiteHide

Type:
Biaxial (-)
RI values:
nα = 1.570 nβ = 1.588 nγ = 1.594
2V:
Measured: 60° (5), Calculated: 59.4°
Max Birefringence:
δ = 0.024
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v
Pleochroism:
Visible
Comments:
Y = Z = colorless, X = greenish-gray

Chemical Properties of TumchaiteHide

Formula:
Na2Zr(Si4O11) · 2H2O
IMA Formula:
Na2ZrSi4O11 · 2H2O

Crystallography of TumchaiteHide

Crystal System:
Monoclinic
Twinning:
Observed on (100)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.40 Å(100)
5.38 Å(90)
4.00 Å(80)
3.401 Å(90)
2.902 Å(90)
2.691 Å(90)

Type Occurrence of TumchaiteHide

General Appearance of Type Material:
Occurs as tabular monoclinic crystals up to 0.2 × 1.2 × 2.5 mm.
Place of Conservation of Type Material:
Gorniy Museum of St. Petersburg Mining Institute (Technical University), St. Petersburg, Russia under catalogue number 3123.
Associated Minerals at Type Locality:
Reference:
Subbotin, V.V., Merlino, S., Pushcharovsky, D.Y., Pakhomovsky, Y.A., Ferro, O., Bogdanova, A.N., Voloshin, A.V., Sorokhtina, N.V., Zubkova, N.V. (2000) Tumchaite Na2(Zr,Sn)Si4O11·2H2O—a new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia. American Mineralogist: 85: 1516-1520.

Synonyms of TumchaiteHide

Other Language Names for TumchaiteHide

German:Tumchait
Spanish:Tumchaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Tumchaite associated with GaidonnayiteNa2Zr(Si3O9) · 2H2O
1 photo of Tumchaite associated with GobbinsiteNa5(Si11Al5)O32 · 11H2O

Related Minerals - Nickel-Strunz GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05GillespiteBaFe2+Si4O10Tet.
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05WesselsiteSrCuSi4O10Tet.
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.25DalyiteK2ZrSi6O15Tric.
9.EA.25DavaniteK2TiSi6O15Tric.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14•6H2OOrth. mm2 : Pmm2
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.45NekoiteCa3Si6O15·7H2OTric. 1 : P1
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Fluorescence of TumchaiteHide

None observed

Other InformationHide

Notes:
Not dissolved by dilute hydrochloric acid
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 TumchaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Subbotin, V.V., Merlino, S., Pushcharovsky, D.Y., Pakhomovsky, Y.A., Ferro, O., Bogdanova, A.N., Voloshin, A.V., Sorokhtina, N.V., Zubkova, N.V. (2000) Tumchaite Na2(Zr,Sn)Si4O11·2H2O—a new mineral from carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia. American Mineralogist: 85: 1516-1520.
Mandarino, J.A. (2002) New minerals. The Canadian Mineralogist: 40: 1001-1020.
Pekov, I.V. (2007) New minerals from former Soviet Union countries, 1998-2006: new minerals approved by the IMA commission on new minerals and mineral names. Mineralogical Almanac: 11: 9-51.

Internet Links for TumchaiteHide

Localities for TumchaiteHide

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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
Unpublished analytical results XRD including single crystal & WDS by A. McDonald.
Russia (TL)
 
  • Murmansk Oblast
    • Northern Karelia
SUBBOTIN, V.V., MERLINO, S., PUSHCHAROVSKY, D.Yu., PAKHOMOVSKY, Y.A., FERRO, O., BOGGANOVA, A.N.,VOLOSHIN, A.V., SOROKHTINA, N.V., ZUBKOVA, N.V. (2000) Tumchaite Na2(Zr,Sn)Si4O11•H2O - A new mineral from the carbonatites of the Vuoriyarvi alkali-ultrabasic massif, Murmansk Region, Russia. American Mineralogist, 85, 1516-1520.
 
Mineral and/or Locality  
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