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Thortveitite Group

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Big Photo

Keiviite-(Y)
Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Pavel M. Kartashov

Show Thortveitite Group Photos (15)



Formula:
REE
 
2
Si
 
2
O
 
7


A group of rare-earth disilicates with the general formula REE2Si2O7; the closely related Ca-Zr-disilicate gittinsite is also included.

Numerous synthetic compounds with the thortveitite structure or a closely related structure are known.

Classification of Thortveitite Group

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Chemical Properties of Thortveitite Group

Formula:
REE
 
2
Si
 
2
O
 
7

Relationship of Thortveitite Group to other Species

Group Members:
Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
Keiviite-(Yb)
(Yb,Y)
 
2
Si
 
2
O
 
7
Minerals structurally related to group:
Gittinsite
CaZrSi
 
2
O
 
7

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.

Internet Links for Thortveitite Group

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    • Localities for Thortveitite Group

    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.
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    (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
    		[Keiviite-(Y)] Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68 + Pers. commentary Gunnar Raade 1988
      • Iveland
        • Ivedal
    		[Keiviite-(Y)] 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)
    		[Keiviite-(Y)] Bjørlykke, H.( 1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
    [Keiviite-(Y)] 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
    		[Keiviite-(Y)] Husdal, T. (2008): The minerals of the pegmatites within the Tysfjord granite, northern Norway. Norsk Bergverksmuseum, skrift 38, 5-28.
    • Svalbard
      • Spitsbergen
        • Hornsund fjord
    		[Keiviite-(Y)] 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
    		[Keiviite-(Y)] 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
    		[Keiviite-(Y)] 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
    		[Keiviite-(Y)] Mineralogical Record (1987) 18 (5), 359-368
    • Värmland
      • Filipstad
    		[Keiviite-(Y)] 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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