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Keiviite-(Yb)

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Formula:
Yb2Si2O7
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
5.95
Crystal System:
Monoclinic
Name:
For the type locality, Keivy massif
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Classification of Keiviite-(Yb)Hide

Approved
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

Physical Properties of Keiviite-(Yb)Hide

Vitreous
Transparency:
Transparent
Colour:
Colourless
Hardness:
4 - 5 on Mohs scale
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

Type:
Biaxial (-)
RI values:
nα = 1.723 nβ = 1.758 nγ = 1.768
2V:
Measured: 58°
Max Birefringence:
δ = 0.045
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r < v strong

Chemical Properties of Keiviite-(Yb)Hide

Formula:
Yb2Si2O7

Crystallography of Keiviite-(Yb)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
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)
Z:
2
Morphology:
Elongated platy and prismatic crystals
Twinning:
Polysynthetic - common

Type Occurrence of Keiviite-(Yb)Hide

Place of Conservation of Type Material:
Fersman Museum
Geological Setting of Type Material:
Microcline bearing pegmatites
Associated Minerals at Type Locality:

Synonyms of Keiviite-(Yb)Hide

Other Language Names for Keiviite-(Yb)Hide

Relationship of Keiviite-(Yb) to other SpeciesHide

Other Members of this group:
Keiviite-(Y)Y2Si2O7
ThortveititeSc2Si2O7Mon.
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Fluorite3 photos of Keiviite-(Yb) associated with Fluorite on mindat.org.
Yttrofluorite3 photos of Keiviite-(Yb) associated with Yttrofluorite on mindat.org.
Keiviite-(Y)2 photos of Keiviite-(Yb) associated with Keiviite-(Y) on mindat.org.
Amazonite1 photo of Keiviite-(Yb) associated with Amazonite on mindat.org.
Monazite-(Ce)1 photo of Keiviite-(Yb) associated with Monazite-(Ce) on mindat.org.
Zinnwaldite1 photo of Keiviite-(Yb) associated with Zinnwaldite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BC.05GittinsiteCaZrSi2O7Mon.
9.BC.05Keiviite-(Y)Y2Si2O7
9.BC.05ThortveititeSc2Si2O7Mon.
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7Tric. 1 : P1
9.BC.10KhibinskiteK2ZrSi2O7Mon.
9.BC.10ParakeldyshiteNa2ZrSi2O7Tric.
9.BC.15RankiniteCa3Si2O7Mon. 2/m : P21/b
9.BC.20BarysilitePb8Mn2+[Si2O7]3Trig.
9.BC.25Edgarbaileyite(Hg-Hg)3Si2O7Mon.
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)Tric. 1
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7Tet. 4

Related Minerals - Dana Grouping (8th Ed.)Hide

55.2.1a.1GittinsiteCaZrSi2O7Mon.
55.2.1a.2Keiviite-(Y)Y2Si2O7
55.2.1a.4ThortveititeSc2Si2O7Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.8.1Thalénite-(Y)Y3Si3O10FMon.
14.8.2Keiviite-(Y)Y2Si2O7
14.8.4Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2xMon.
14.8.5ThortveititeSc2Si2O7Mon.
14.8.6Sazhinite-(Ce)Na2CeSi6O14•6H2O
14.8.7Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2OMon. 2/m
14.8.8Iraqite-(La)KCa2(La,Ce,Th)Si8O20Tet.
14.8.9Ashcroftine-(Y)K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
14.8.10Nordite-(La)(La,Ce)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.11Nordite-(Ce)(Ce,La)(Sr,Ca)Na2(Na,Mn)(Zn,Mg)Si6O17
14.8.12JervisiteNaSc3+Si2O6Mon.
14.8.13Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
14.8.14CascanditeCa(Sc,Fe3+)(HSi3O9)Tric.

Fluorescence of Keiviite-(Yb)Hide

Faint green cathodoluminescence

Other InformationHide

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 Keiviite-(Yb)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1984): 69: 1191.

Internet Links for Keiviite-(Yb)Hide

Localities for Keiviite-(Yb)Hide

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.
Norway
 
  • Nordland
    • Tysfjord
Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Keivy Mountains
          • Western Keivy Massif
Voloshin A.V., Pakhomovskii Ya.A., Tyusheva F.N. [Волошин А.В., Пахомовский Я.А., Тюшева Ф.Н.] (1983): Keiviite, Yb2Si2O7 - a new ytterbium silicate from amazonite pegmatites of the Kola Peninsula [Кейвиит, Yb2Si2O7 - новый иттербиевый силикат из амазонитовых пегматитов Кольского полуострова]. Min. Zhurnal [Мин. Журнал], 5, 94-99 (in Russian); Voloshin A.V., Pakhomovskii Ya.A. [Волошин А. В., Пахомовский Я. А.] (1986): Minerals and evolution of mineral formation in amazonite pegmatites of the Kola Peninsula [Минералы и эволюция минералообразования в амазонитовых пегматитах Кольского полуострова]. Nauka, Leningrad, 168 pp. (in Russian); Pekov I.V. (1998): Minerals first discovered on the territory of the former Soviet Union. Ocean Pictures, Moscow, 369 pp.
Mineral and/or Locality  
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