Vyuntspakhkite-(Y) (original) (raw)

A valid IMA mineral species

About Vyuntspakhkite-(Y)Hide

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Formula:

(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7

Crystal System:

Monoclinic

Name:

Named after the highest mountain (Mt. Vyuntspakhk) in the region of the type locality.

A very rare yttrium mineral in pegmatites.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4222:8

7b91f60c-dde5-4103-b594-dbd784e648fd

IMA Classification of Vyuntspakhkite-(Y)Hide

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IMA Formula:

Y(Al,Si)(SiO4)(OH,O)2

Type description reference:

Classification of Vyuntspakhkite-(Y)Hide

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9.BG.40

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

61.1.18.1

61 : CYCLOSILICATES Six-Membered Rings
1 : Six-Membered Rings with [Si6O18] rings; possible (OH) and Al substitution

16.13.1

16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths

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 Vyuntspakhkite-(Y)Hide

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Density:

4.02 g/cm3 (Measured) 4.07 g/cm3 (Calculated)

Optical Data of Vyuntspakhkite-(Y)Hide

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RI values:

_n_α = 1.680 _n_β = 1.692 _n_γ = 1.720

2V:

Measured: 68° , Calculated: 66°

δ = 0.040

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

Chemistry of Vyuntspakhkite-(Y)Hide

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Mindat Formula:

(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7

Crystallography of Vyuntspakhkite-(Y)Hide

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Crystal System:

Monoclinic

Cell Parameters:

a = 5.7551(11) Å, b = 14.752(3) Å, c = 15.906(4) Å
β = 96.046(4)°

Ratio:

a:b:c = 0.39 : 1 : 1.078

Unit Cell V:

1,342.90 ų (Calculated from Unit Cell)

Morphology:

Microinclusions in yttrofluorite.

Comment:

Space group: P21/n, Cell parameters from Yakbovich & Steele (2009)

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of Vyuntspakhkite-(Y)Hide

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General Appearance of Type Material:

0.5- 0.7 mm large , slender, prismatic crystals in small cavities within violet fine grained fluorite.

Place of Conservation of Type Material:

Geology Museum, Kola Branch, Academy of Sciences, Apatity, 5767; Mining Institute, St. Petersburg, 1341/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 82544.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Voloshin, A. V., Pakhomovsky, Ya. A.,Menshikov,Yu P.,Povarennykh, A.S. and Rogachev, D.L. (1983) Vyuntspakhite Y4Al2AlSi5O18(OH)5 a new yttrium-aluminum silicate from amazonite pegmatites of the Kola Peninsula. Mineralogicheskii Zhurnal (1983): 5(4): 89-94.

Synonyms of Vyuntspakhkite-(Y)Hide

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Other Language Names for Vyuntspakhkite-(Y)Hide

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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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Other InformationHide

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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 Vyuntspakhkite-(Y)Hide

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References for Vyuntspakhkite-(Y)Hide

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Reference List:

Dunn, P.J., Cabri, L.J., Ferraiolo, J.A., Grice, J.D., Jambor, J.L., Mueller, W., Shigley, J.E., Puziewicz, J., Vanko, D.A. (1984) New mineral names. American Mineralogist: 69: 1190-1196.

Localities for Vyuntspakhkite-(Y)Hide

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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.