Tumchaite
A valid IMA mineral species
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About Tumchaite
Tumcha River, Russia
Formula:
Na2Zr(Si4O11) · 2H2O
Colour:
Colourless to white
Lustre:
Vitreous
Hardness:
4½
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.
Unique Identifiers
Mindat ID:
7102
Long-form identifier:
mindat:1:1:7102:0
Similar Names
| Tomichite | A valid IMA mineral species | (V,Fe)4Ti3AsO13(OH) |
IMA Classification of Tumchaite
Approved
IMA Formula:
Na2ZrSi4O11 · 2H2O
Approval year:
1999
First published:
2000
Type description reference:
Subbotin, Victor V., Merlino, Stefano, Pushcharovsky, Dmitry Yu., Pakhomovsky, Yakov A., Ferro, Orazio, Bogdanova, Alla N., Voloshin, Anatoly V., Sorokhtina, Natalia V., Zubkova, Natalia 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 (10) 1516-1520 doi:10.2138/am-2000-1024
Classification of Tumchaite
9.EA.60
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Tum | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Tumchaite
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
{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 Tumchaite
Type:
Biaxial (-)
RI values:
nα = 1.570(2) nβ = 1.588(2) nγ = 1.594(2)
2V:
Measured: 60° (5), Calculated: 59.4°
Max. Birefringence:
δ = 0.024
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Dispersion:
r > v
Optical Extinction:
Y = b, c ∧ Z = 3°. Positive elongation.
Pleochroism:
Visible
Comments:
Y = Z = colorless, X = greenish-gray
Chemistry of Tumchaite
Mindat Formula:
Na2Zr(Si4O11) · 2H2O
Element Weights:
Crystallography of Tumchaite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 9.144(4) Å, b = 8.818(3) Å, c = 7.537(3) Å
β = 113.22(3)°
β = 113.22(3)°
Ratio:
a:b:c = 1.037 : 1 : 0.855
Unit Cell V:
558.49 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Observed on (100)
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.40 Å | (100) |
| 5.38 Å | (90) |
| 4.00 Å | (80) |
| 3.401 Å | (90) |
| 2.902 Å | (90) |
| 2.691 Å | (90) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Tumchaite
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, Victor V., Merlino, Stefano, Pushcharovsky, Dmitry Yu., Pakhomovsky, Yakov A., Ferro, Orazio, Bogdanova, Alla N., Voloshin, Anatoly V., Sorokhtina, Natalia V., Zubkova, Natalia 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 (10) 1516-1520 doi:10.2138/am-2000-1024
Synonyms of Tumchaite
Other Language Names for Tumchaite
Common Associates
Associations Based on Photo Data:
| 4 photos of Tumchaite associated with Gaidonnayite | Na2Zr(Si3O9) · 2H2O |
| 1 photo of Tumchaite associated with Gobbinsite | Na5(Si11Al5)O32 · 11H2O |
Related Minerals - Strunz-mindat Grouping
| 9.EA. | Hydroxymcglassonite-(K) | KSr4Si8O20(OH) · 8H2O |
| 9.EA. | Miyawakiite-(Y) | ◻Y4Fe2(Si8O20)(CO3)4(H2O)3 |
| 9.EA. | Bussyite-(Y) | (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 |
| 9.EA. | Fluorapophyllite-(NH4) | NH4Ca4(Si8O20)F · 8H2O |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.07 | Fluorapophyllite-(Cs) | CsCa4(Si8O20)F · 8H2O |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4(Si8O20)F · 8H2O |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4(Si8O20)(F,OH) · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4(Si8O20)(OH,F) · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(La) | Na3La[Si6O15] · 2H2O |
| 9.EA.30 | Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 9.EA.35 | Armstrongite | CaZr[Si6O15] · 3H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Perettiite-(Y) | Y2Mn4FeSi2B8O24 |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.45 | Badakhshanite-(Y) | Y2Mn4Al(Si2B7BeO24) |
| 9.EA.47 | Shlykovite | KCa[Si4O9(OH)] · 3H2O |
| 9.EA.50 | Diegogattaite | Na2CaCu2Si8O20 · H2O |
| 9.EA.50 | Cavansite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.52 | Yangite | PbMnSi3O8 · H2O |
| 9.EA.55 | Pentagonite | Ca(VO)Si4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | (K,Na)Cu7AlSi9O24(OH)6 · 3H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3[Si18O45]*2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Fluorescence of Tumchaite
None observed
Other Information
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.
Internet Links for Tumchaite
mindat.org URL:
https://www.mindat.org/min-7102.html
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References for Tumchaite
Reference List:
Subbotin, Victor V., Merlino, Stefano, Pushcharovsky, Dmitry Yu., Pakhomovsky, Yakov A., Ferro, Orazio, Bogdanova, Alla N., Voloshin, Anatoly V., Sorokhtina, Natalia V., Zubkova, Natalia 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 (10) 1516-1520 doi:10.2138/am-2000-1024
Localities for Tumchaite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada | |
| Horváth et al. (2019) |
Russia (TL) | |
| Subbotin et al. (2000) |
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Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada