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Keiviite-(Y)

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Big Photo

Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Pavel M. Kartashov

Show Keiviite-(Y) Photos (12)



Formula:
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
Hardness:4 - 5
Member of:Thortveitite Group


Keiviite-(Y)-Keiviite-(Yb) Series.

Classification of Keiviite-(Y)

IMA status:Approved
Strunz 8th edition ID:8/C.01-20
Nickel-Strunz 10th (pending) edition ID:9.BC.05

9 : SILICATES (Germanates)
B : Sorosilicates
C : Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
Dana 8th edition ID:55.2.1a.2

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
2 : Si2O7 Groups, Generally with no Additional Anions with cations in [6] coordination
Hey's CIM Ref.:14.8.2

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Keiviite-(Y)

Type Locality:Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Physical Properties of Keiviite-(Y)

Hardness (Mohs):4 - 5

Optical Data of Keiviite-(Y)

Type:Biaxial (-)
RI values: nα = 1.713 nβ = 1.748 nγ = 1.758
2V:Measured: 55° to 56°, Calculated: 54°
Maximum Birefringence:δ = 0.045

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:weak

Chemical Properties of Keiviite-(Y)

Formula:
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
Essential elements:O, Si, Y
All elements listed in formula:O, Si, Y, Yb

Relationship of Keiviite-(Y) to other Species

Series:Forms a series with Keiviite-(Yb) (see here)
Member of:Thortveitite Group
Other Members of Group:

- +
Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
Related Minerals - Nickel-Strunz Grouping):

- +
9.BC.05Gittinsite
CaZrSi
 
2
O
 
7
9.BC.05Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
9.BC.05Thortveitite
(Sc,Y)
 
2
Si
 
2
O
 
7
9.BC.05Yttrialite-(Y)
(Y,Th)
 
2
Si
 
2
O
 
7
9.BC.10Keldyshite
(Na,H)
 
2
ZrSi
 
2
O
 
7
9.BC.10Khibinskite
K
 
2
ZrSi
 
2
O
 
7
9.BC.10Parakeldyshite
Na
 
2
ZrSi
 
2
O
 
7
9.BC.15Rankinite
Ca
 
3
Si
 
2
O
 
7
9.BC.20Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
9.BC.25Edgarbaileyite
(Hg-Hg)
 
3
Si
 
2
O
 
7
9.BC.30Kristiansenite
Ca
 
2
ScSn(Si
 
2
O
 
7
)(Si
 
2
O
 
6
OH)
9.BC.35Percleveite-(Ce)
(Ce,La,Nd)
 
2
Si
 
2
O
 
7
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
(Si
 
3
O
 
10
)(OH)
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
14.8.4Tombarthite-(Y)
Y
 
4
(Si,H
 
4
)
 
4
O
 
12-x
(OH)
 
4+2x
14.8.5Thortveitite
(Sc,Y)
 
2
Si
 
2
O
 
7
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.7Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
 · 10H
 
2
O
14.8.8Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
14.8.9Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
 · 8H
 
2
O
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.12Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Fe,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)(HSi
 
3
O
 
9
)

Other Names for Keiviite-(Y)

Synonyms:
IMA1984-054Keivyite-(Y)
Other Languages:
Russian:Кейвиит-(Y)

Other Information

Health Warning: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-(Y)

Reference List:

- +
American Mineralogist (1988): 73: 191-192.

M. Allix, M. D. Alba, P. Florian, A. J. Fernandez-Carrion, M. R. Suchomel, A. Escudero, E. Suard and A. I. Becerro (2011): Structural elucidation of beta-(Y,Sc)2Si2O7: combined use of 89Y MAS NMR and powder diffraction. J. Appl. Crystallogr. 44, 846-852.

Internet Links for Keiviite-(Y)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Keiviite-(Y) details from Handbook of Mineralogy (PDF)
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    • Localities for Keiviite-(Y)

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
     
    • Aust-Agder
      • Evje og Hornnes
    		Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68 + Pers. commentary Gunnar Raade 1988
      • Iveland
        • Ivedal
    		Bjørlykke, H. (1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311 ; Nilssen, B. (1971): Yttrialite from Ivedal, Iveland, South Norway. Norsk Geologisk Tidsskrift 51, 1-8
        • Rossås (Rosås)
    		Bjørlykke, H.( 1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
    Bjørlykke, H.( 1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
    • Nordland
      • Tysfjord
    		Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    • Svalbard
      • Spitsbergen
        • Hornsund fjord
    		 Pršek, J., Majka, J., Uher, P. & Chudík, P. (2010): Niobium-tantalum minerals in the Skoddefjellet NYF granitic pegmatite, Svalbard Archipelago, Norway: Primary versus secondary assemblage. Neues Jahrbuch für Mineralogie - Abhandlungen 187, 235-248
    • Vest-Agder
      • Vennesla
    		Griffin, W.L., Nilssen, B. & Jensen, B.B. (1979): Britholite-(Y) and its alteration: Reiarsdal, Vest-Agder, south Norway. Norsk Geologisk Tidsskrift 59: 265-271
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Western Keivy Massif
    		A.V. Voloshin, Ya.A. Pakhomovskii Minerals and mineralformation evolution in amazonite pegmatites of Kola peninsula, - Leningrad, Nauka, 1986, pp.168.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Sweden
     
    • Uppland
      • Vaxholm
        • Resarö
    		Mineralogical Record (1987) 18 (5), 359-368
    • Värmland
      • Filipstad
    		Kristiansen, Roy (1993): Thalenitt-liknende mineraler fra Åskagen, Sverige. STEIN 20 (19), 7-8 + 58-60
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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