Tumchaite (original) (raw)

A valid IMA mineral species

About TumchaiteHide

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Formula:

Na2Zr(Si4O11) · 2H2O

Colour:

Colourless to white

Crystal System:

Monoclinic

Name:

Named for the Tumcha River, which passes near the type locality of Vuoriyarvi massif, North Karelia, Murmanskaja Oblast', Russia.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:7102:0

cc807a04-16b3-498b-a3f1-6c226ba7a49d

IMA Classification of TumchaiteHide

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IMA Formula:

Na2ZrSi4O11 · 2H2O

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 TumchaiteHide

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9.EA.60

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of TumchaiteHide

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Transparency:

Transparent, Translucent

Colour:

Colourless to white

Hardness:

VHN40=365 - 445 kg/mm2 - Vickers

Cleavage:

Perfect
{100} perfect

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

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RI values:

_n_α = 1.570(2) _n_β = 1.588(2) _n_γ = 1.594(2)

2V:

Measured: 60° (5), Calculated: 59.4°

δ = 0.024

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Optical Extinction:

Y = b, c ∧ Z = 3°. Positive elongation.

Comments:

Y = Z = colorless, X = greenish-gray

Chemistry of TumchaiteHide

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Mindat Formula:

Na2Zr(Si4O11) · 2H2O

Crystallography of TumchaiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 9.144(4) Å, b = 8.818(3) Å, c = 7.537(3) Å
β = 113.22(3)°

Ratio:

a:b:c = 1.037 : 1 : 0.855

Unit Cell V:

558.49 ų (Calculated from Unit Cell)

Twinning:

Observed on (100)

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of TumchaiteHide

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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

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Other Language Names for TumchaiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of TumchaiteHide

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Other InformationHide

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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 TumchaiteHide

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References for TumchaiteHide

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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 TumchaiteHide

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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

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- 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). 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.