Keiviite-(Yb) (original) (raw)

A valid IMA mineral species

About Keiviite-(Yb)Hide

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Crystal System:

Monoclinic

Name:

Originally translated from Russian to keiviite but also appears as keivite and keivyite. The suffix was added later by the IMA to conform to the nomenclature for rare-earth-element bearing minerals. The root name is for the type locality, Keivy massif, Russia.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2178:0

2691678d-0edc-47c6-b8f4-65864f8ba813

IMA Classification of Keiviite-(Yb)Hide

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IMA status notes:

Renamed by the IMA

Type description reference:

Classification of Keiviite-(Yb)Hide

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9.BC.05

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination

55.2.1a.3

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination

14.8.3

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al

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 Keiviite-(Yb)Hide

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Cleavage:

Perfect
perfect on {110}, imperfect on {001}

Density:

5.95 g/cm3 (Measured) 5.99 g/cm3 (Calculated)

Optical Data of Keiviite-(Yb)Hide

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RI values:

_n_α = 1.723 _n_β = 1.758 _n_γ = 1.768

δ = 0.045

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

Optical Extinction:

Z = b; X ∧ c = 3°-5°; Y ∧ a = 7°-8°.

Chemistry of Keiviite-(Yb)Hide

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Crystallography of Keiviite-(Yb)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 6.840(2) Å, b = 8.916(2) Å, c = 4.745(1) Å
β = 102.11(3)°

Ratio:

a:b:c = 0.767 : 1 : 0.532

Unit Cell V:

282.94 ų (Calculated from Unit Cell)

Morphology:

Elongated platy and prismatic crystals.

Twinning:

Polysynthetic - common.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0009370	Keiviite-(Yb)	Smolin Y I, Shepelev Y F (1970) The crystal structures of the rare earth pyrosilicates Acta Crystallographica B26 484-492		1970	synthetic	0	293
0015614	Keiviite-(Yb)	Yakubovich O V, Simonov M A, Voloshin A V, Pakhomovsky Y A (1986) Crystal structure of keivite Yb2[Si2O7] Soviet Physics Doklady 31 930-932	1986	Kola Peninsula, Russia	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Mt. Ploskaya, Russia. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of Keiviite-(Yb)Hide

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General Appearance of Type Material:

Single crystals and intergrowths 0.1-0.8 mm.

Place of Conservation of Type Material:

A.E. Fersman Museum, Moscow, Russia.

Geological Setting of Type Material:

Microcline bearing pegmatites.

Associated Minerals at Type Locality:

Reference:

Voloshin, A.V., Pakhomovsky, Y.A., Tyusheva, F.N. (1983) Keiviite Yb2Si2O7 - a new ytterbium silicate from amazonitic pegmatites of the Kola Peninsula. Mineralogiceskij Zhurnal: 5: 94-99.

Synonyms of Keiviite-(Yb)Hide

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Other Language Names for Keiviite-(Yb)Hide

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Relationship of Keiviite-(Yb) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of Keiviite-(Yb)Hide

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Faint green cathodoluminescence.

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 Keiviite-(Yb)Hide

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References for Keiviite-(Yb)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 (1191).

Localities for Keiviite-(Yb)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.