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Lokkaite-(Y)

A valid IMA mineral species
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Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O
Colour:
snow white, may be discolored to pale yellow.
Specific Gravity:
2.92 (Calculated)
Crystal System:
Orthorhombic
Member of:
Tengerite Group
Name:
Named in honor of Lauri Lokka (1885–1966), Finnish mineralogist and Chief Chemist, Geological Survey of Finland, Helsinki, Finland.
Type Locality:
ⓘPyörönmaa pegmatite, Valkeakoski, Pirkanmaa, Finland
This page provides mineralogical data about Lokkaite-(Y).


Unique Identifiers
IMA Formula:
CaY4(CO3)7 · 9H2O
Approval year:
1969
First published:
1970
Type description reference:
Perttunen, V. (1970) Lokkaite, a new hydrous RE-carbonate from Pyörönmaa pegmatite in Kangasala, SW-Finland. Bulletin of the Geological Society of Finland: 43: 67-72.

Classification of Lokkaite-(Y)
Dana 8th ed.:
15.4.4.1

15 : HYDRATED NORMAL CARBONATES
4 : AmBn(XO3)p·xH2O, with (m+n):p < 1:1
Hey's CIM Ref.:
11.8.11

11 : Carbonates
8 : Carbonates of the rare earths

Mineral Symbols
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemistry of Lokkaite-(Y)

Crystallography of Lokkaite-(Y)
Geological Setting of Type Material:
secondary mineral formed by alteration of primary rare-earth minerals.
Associated Minerals at Type Locality:
Tengerite-(Y)
Reference:
Perttunen, V. (1970) Lokkaite, a new hydrous RE-carbonate from Pyörönmaa pegmatite in Kangasala, SW-Finland. Bulletin of the Geological Society of Finland: 43: 67-72.

Synonyms of Lokkaite-(Y)

Other Language Names for Lokkaite-(Y)

Relationship of Lokkaite-(Y) to other Species
Other Members of Tengerite Group:
Hizenite-(Y)Ca2Y6(CO3)11 · 14H2OOrth.
Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2OOrth.
Tengerite-(Y)Y2(CO3)3 · 2-3H2OOrth.mmm(2/m2/m2/m) :Pnnm

Common AssociatesTric. 1 :P15.CC.Yuchuanite-(Y)Y2(CO3)3 · H2OTric.1 :P15.CC.Alicewilsonite-(YCe)Na2Sr2YCe(CO3)6 · 3H2OTric. 1 :P15.CC.05Donnayite-(Y)NaCaSr3Y(CO3)6 · 3H2OTric. 1 :P15.CC.05Alicewilsonite-(YLa)Na2Sr2YLa(CO3)6 · 3H2OTric. 1 :P15.CC.05Mckelveyite-(Nd)NaCaBa3Nd(CO3)6 · 3H2OMon.m :Bb5.CC.05Mckelveyite-(Y)NaCaBa3Y(CO3)6 · 3H2OTric. 1 :P15.CC.05EwalditeBa(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2OHex. 6mm :P63mc5.CC.05UM1992-05-CO:CaCeLaNaSr(Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2OTrig. 3m :R3m5.CC.05WeloganiteNa2Sr3Zr(CO3)6 · 3H2OTric. 1 :P15.CC.05Mckelveyite GroupA3B3(CO3)6 · 3H2O5.CC.05Bainbridgeite-(YCe)Na2Ba2YCe(CO3)6 · 3H2OTric. 1 :P15.CC.05Unnamed (MSH UK-37A)Sr3NaCaY(CO3)6 · 3H2OHex. 6mm :P63mc5.CC.10Tengerite-(Y)Y2(CO3)3 · 2-3H2OOrth.mmm(2/m2/m2/m) :Pnnm5.CC.15Kimuraite-(Y)Ca(Y,Nd)2(CO3)4 · 6H2OOrth.5.CC.15Hizenite-(Y)Ca2Y6(CO3)11 · 14H2OOrth.5.CC.20Shomiokite-(Y)Na3Y[CO3]3 · 3H2OOrth.mm25.CC.25Lanthanite-(Ce)(Ce,La,Nd)2(CO3)3 · 8H2OOrth.mmm(2/m2/m2/m)5.CC.25Lanthanite-(La)(La,Ce)2(CO3)3 · 8H2OOrth.mmm(2/m2/m2/m)5.CC.25Lanthanite-(Nd)(Nd,La)2(CO3)3 · 8H2OOrth.mmm(2/m2/m2/m)5.CC.25Calkinsite-(Ce)(Ce,La)2(CO3)3 · 4H2OOrth.5.CC.30Adamsite-(Y)NaY[CO3]2 · 6H2OTric. 1 :P15.CC.35Decrespignyite-(Y)Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2OMon.5.CC.40Galgenbergite-(Ce)Ca(Ce,La,Nd)2(CO3)4 · H2OTric.1 :P15.CC.45Lecoqite-(Y)Na3Y(CO3)3 · 6H2OHex. 6 :P63

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    • References for Lokkaite-(Y)ⓘCardiff Uranium MineReiner Mielke 2011Hogarth et al. (1974)
    Finland (TL)
     
    Perttunen 1971 Bulletin of the ...+1 other reference
    Japan
     
    NISHIO-HAMANE et al. (2024)Takai et al. (2010)Nagashima et al. (1986)Miyawaki et al. (2003)
    Norway
     
    Neumann (1985)Kristiansen (1975)+1 other referenceNeumann (1985)
    Sweden
     
    USA
     
    Julian Gray
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