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Keiviite-(Yb)

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Formula:
(Yb,Y)2Si2O7
System:
Monoclinic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
4 - 5
Name:
For the type locality, Keivy massif

Classification of Keiviite-(Yb)

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
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Type Occurrence of Keiviite-(Yb)

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

Physical Properties of Keiviite-(Yb)

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless
Hardness (Mohs):
4 - 5
Cleavage:
Perfect
perfect on {110}, imperfect on {001}
Density:
5.95 g/cm3 (Measured)    5.99 g/cm3 (Calculated)

Crystallography of Keiviite-(Yb)

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 Volume:
V 282.94 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated platy and prismatic crystals
Twinning:
Polysynthetic - common

Optical Data of Keiviite-(Yb)

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)

Formula:
(Yb,Y)2Si2O7
Essential elements:
All elements listed in formula:

Relationship of Keiviite-(Yb) to other Species

Series:
Forms a series with Keiviite-(Y) (see here)
Other Members of Group:
Keiviite-(Y)(Y,Yb)2[Si2O7]
9.BC.05GittinsiteCaZrSi2O7
9.BC.05Keiviite-(Y)(Y,Yb)2[Si2O7]
9.BC.05Thortveitite(Sc,Y)2Si2O7
9.BC.05Yttrialite-(Y)(Y,Th)2Si2O7
9.BC.10Keldyshite(Na,H)2ZrSi2O7
9.BC.10KhibinskiteK2ZrSi2O7
9.BC.10ParakeldyshiteNa2ZrSi2O7
9.BC.15RankiniteCa3Si2O7
9.BC.20BarysilitePb8Mn2+[Si2O7]3
9.BC.25Edgarbaileyite(Hg-Hg)3Si2O7
9.BC.30KristianseniteCa2ScSn(Si2O7)(Si2O6OH)
9.BC.35Percleveite-(Ce)(Ce,La,Nd)2Si2O7
14.8.1Thalénite-(Y)Y3Si3O10F
14.8.2Keiviite-(Y)(Y,Yb)2[Si2O7]
14.8.4Tombarthite-(Y)Y4(Si,H4)4O12-x(OH)4+2x
14.8.5Thortveitite(Sc,Y)2Si2O7
14.8.6Sazhinite-(Ce)Na3Ce[Si6O15] · 6H2O
14.8.7Monteregianite-(Y)(Na,K)6(Y,Ca)2Si16O38 · 10H2O
14.8.8Iraqite-(La)K(Ca,Na)2(La,Ce,Th)[(Si,Al)8O20]
14.8.9Ashcroftine-(Y)K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8 · 8H2O
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
14.8.12Jervisite(Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
14.8.13Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
14.8.14CascanditeCa(Sc,Fe3+)(HSi3O9)

Other Names for Keiviite-(Yb)

Name in Other Languages:

Other Information

Faint green cathodoluminescence
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)

Reference List:
American Mineralogist (1984): 69: 1191.

Internet Links for Keiviite-(Yb)

Localities for Keiviite-(Yb)

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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
A.V. Voloshin, Ya.A. Pakhomovskii Minerals and mineralformation evolution in amazonite pegmatites of Kola peninsula, - Leningrad, Nauka, 1986, pp.168.
Mineral and/or Locality  
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