Lokkaite-(Y)
A valid IMA mineral species
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About Lokkaite-(Y)
Lauri Lokka
Formula:
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:
Name:
Named in honor of Lauri Lokka (1885–1966), Finnish mineralogist and Chief Chemist, Geological Survey of Finland, Helsinki, Finland.
Type Locality:
This page provides mineralogical data about Lokkaite-(Y).
Unique Identifiers
Mindat ID:
2427
Long-form identifier:
mindat:1:1:2427:9
Similar Names
| Leakeite | NaNa2(Mg2Al2Li)(Si8O22)(OH)2 | |
| Luckite | A synonym of 'Manganese-bearing Melanterite' |
IMA Classification of Lokkaite-(Y)
Approved
IMA Formula:
CaY4(CO3)7·9H2O
Approval year:
1969
First published:
1970
Classification of Lokkaite-(Y)
5.CC.15
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
5 : CARBONATES (NITRATES)
C : Carbonates without additional anions, with H2O
C : With rare earth elements (REE)
15.4.4.1
15 : HYDRATED NORMAL CARBONATES
4 : AmBn(XO3)p·xH2O, with (m+n):p < 1:1
15 : HYDRATED NORMAL CARBONATES
4 : AmBn(XO3)p·xH2O, with (m+n):p < 1:1
11.8.11
11 : Carbonates
8 : Carbonates of the rare earths
11 : Carbonates
8 : Carbonates of the rare earths
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Lok-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Lokkaite-(Y)
Transparency:
Translucent
Colour:
Snow white, may be discolored to pale yellow.
Streak:
White
Tenacity:
Brittle
Density:
2.92 g/cm3 (Calculated)
Optical Data of Lokkaite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.569 nβ = 1.592 nγ = 1.620
Max. Birefringence:
δ = 0.051
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Lokkaite-(Y)
Mindat Formula:
Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O
Element Weights:
Crystallography of Lokkaite-(Y)
Crystal System:
Orthorhombic
Cell Parameters:
a = 39.21(18) Å, b = 6.950(11) Å, c = 9.22(4) Å
Ratio:
a:b:c = 5.642 : 1 : 1.327
Unit Cell V:
2,512.54 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Fibrous crystal bundles, powdery incrustations.
Comment:
Point Group: 2/m 2/m 2/m or mm2.; Space Group: P bmm, P b2m, or P bm2.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.808 Å | (100) |
| 4.594 Å | (75) |
| 3.902 Å | (60) |
| 6.509 Å | (55) |
| 9.77 Å | (50) |
| 5.792 Å | (45) |
| 2.931 Å | (40) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Lokkaite-(Y)
Geological Setting of Type Material:
secondary mineral formed by alteration of primary rare-earth minerals.
Associated Minerals at Type Locality:
Synonyms of Lokkaite-(Y)
Other Language Names for Lokkaite-(Y)
Dutch:Lokkaiet-(Y)
German:Lokkait-(Y)
Lokkait
Lokkait
Simplified Chinese:水碳钇石
Spanish:Lokkaita
Traditional Chinese:水碳釔石
Relationship of Lokkaite-(Y) to other Species
Member of:
Other Members of Tengerite Group:
| Hizenite-(Y) | Ca2Y6(CO3)11 · 14H2O | Orth. |
| Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 · 6H2O | Orth. |
| Tengerite-(Y) | Y2(CO3)3 · 2-3H2O | Orth. mmm(2/m2/m2/m) : Pnnm |
Common Associates
Associations Based on Photo Data:
| 9 photos of Lokkaite-(Y) associated with Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 · 6H2O |
| 6 photos of Lokkaite-(Y) associated with Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 2 photos of Lokkaite-(Y) associated with Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
| 2 photos of Lokkaite-(Y) associated with Kainosite-(Y) | Ca2Y2(SiO3)4(CO3) · H2O |
| 1 photo of Lokkaite-(Y) associated with Fergusonite-(Y) | YNbO4 |
| 1 photo of Lokkaite-(Y) associated with Microcline | K(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
| 5.CC. | Bainbridgeite-(NdCe) | Na2Ba2NdCe(CO3)6 · 3H2O |
| 5.CC. | Yuchuanite-(Y) | Y2(CO3)3 · H2O |
| 5.CC. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 · 3H2O |
| 5.CC.05 | Donnayite-(Y) | NaCaSr3Y(CO3)6 · 3H2O |
| 5.CC.05 | Alicewilsonite-(YLa) | Na2Sr2YLa(CO3)6 · 3H2O |
| 5.CC.05 | Mckelveyite-(Nd) | NaCaBa3Nd(CO3)6 · 3H2O |
| 5.CC.05 | Mckelveyite-(Y) | NaCaBa3Y(CO3)6 · 3H2O |
| 5.CC.05 | Ewaldite | Ba(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O |
| 5.CC.05 | 'UM1992-05-CO:CaCeLaNaSr' | (Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2O |
| 5.CC.05 | Weloganite | Na2Sr3Zr(CO3)6 · 3H2O |
| 5.CC.05 | Mckelveyite Group | A3B3(CO3)6 · 3H2O |
| 5.CC.05 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 · 3H2O |
| 5.CC.05 | 'Unnamed (MSH UK-37A)' | Sr3NaCaY(CO3)6 · 3H2O |
| 5.CC.10 | Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 5.CC.15 | Kimuraite-(Y) | Ca(Y,Nd)2(CO3)4 · 6H2O |
| 5.CC.15 | Hizenite-(Y) | Ca2Y6(CO3)11 · 14H2O |
| 5.CC.20 | Shomiokite-(Y) | Na3Y[CO3]3 · 3H2O |
| 5.CC.25 | Lanthanite-(Ce) | Ce2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(La) | La2(CO3)3 · 8H2O |
| 5.CC.25 | Lanthanite-(Nd) | Nd2(CO3)3 · 8H2O |
| 5.CC.25 | Calkinsite-(Ce) | (Ce,La)2(CO3)3 · 4H2O |
| 5.CC.30 | Adamsite-(Y) | NaY[CO3]2 · 6H2O |
| 5.CC.35 | Decrespignyite-(Y) | Cu(Y,REE)4(CO3)4(OH)5Cl · 2H2O |
| 5.CC.40 | Galgenbergite-(Ce) | Ca(Ce,La,Nd)2(CO3)4 · H2O |
| 5.CC.45 | Lecoqite-(Y) | Na3Y(CO3)3 · 6H2O |
Other Information
Health Risks:
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 Lokkaite-(Y)
mindat.org URL:
https://www.mindat.org/min-2427.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Lokkaite-(Y)
Reference List:
Nagashima, K., Miyawaki, R., Takase, J., Nakai, I., Sakurai, K., Matsubara, S., Kato, A., Iwano, S. (1986) Kimuraite, CaY2(CO3)4·6H2O, a new mineral from fissures in an alkali olivine basalt from Saga Prefecture, Japan, and new data on lokkaite. American Mineralogist, 71 (7-8) 1028-1033
Nickel, Ernest H., Mandarino, Joseph A. (1987) Procedures involving the IMA Commission on New Minerals and Mineral Names and guidelines on mineral nomenclature. American Mineralogist, 72 (9-10) 1031-1042
Localities for Lokkaite-(Y)
Showing 13 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Canada | |
| Reiner Mielke 2011 |
| Hogarth 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 reference |
| Neumann (1985) |
Sweden | |
| |
| |
USA | |
| Julian Gray |
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Hundholmen, Narvik, Nordland, Norway