Lokkaite-(Y)
A valid IMA mineral species
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About Lokkaite-(Y)
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
GUID
(UUID V4):
(UUID V4):
f90622c6-be47-49c5-bd45-03b5e38ae408
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 |
---|---|---|
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Chemistry of Lokkaite-(Y)
Mindat Formula:
Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O
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:
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
Member of:
Other Members of this 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/m 2/m 2/m) : Pnnm |
Common Associates
Associated Minerals 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) | Ca2(Y,Ce)2(Si4O12)(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. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 · 3H2O |
5.CC. | Yuchuanite-(Y) | Y2(CO3)3 · H2O |
5.CC. | Bainbridgeite-(NdCe) | Na2Ba2NdCe(CO3)6 · 3H2O |
5.CC.05 | Donnayite-(Y) | NaCaSr3Y(CO3)6 · 3H2O |
5.CC.05 | Ewaldite | Ba(Na,Ca,Y,Ce,K)(CO3)2 · 2.6H2O |
5.CC.05 | Mckelveyite-(Nd) | NaCaBa3Nd(CO3)6 · 3H2O |
5.CC.05 | Mckelveyite-(Y) | NaCaBa3Y(CO3)6 · 3H2O |
5.CC.05 | Weloganite | Na2Sr3Zr(CO3)6 · 3H2O |
5.CC.05 | Unnamed (MSH UK-37A) | Sr3NaCaY(CO3)6 · 3H2O |
5.CC.05 | UM1992-05-CO:CaCeLaNaSr | (Sr,Na,Y,REE,Ca,Ba)2(CO3)2 · H2O |
5.CC.05 | Mckelveyite Group | A3B3(CO3)6 · 3H2O |
5.CC.05 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 · 3H2O |
5.CC.05 | Alicewilsonite-(YLa) | Na2Sr2YLa(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 | Calkinsite-(Ce) | (Ce,La)2(CO3)3 · 4H2O |
5.CC.25 | Lanthanite-(Ce) | (Ce,La,Nd)2(CO3)3 · 8H2O |
5.CC.25 | Lanthanite-(La) | (La,Ce)2(CO3)3 · 8H2O |
5.CC.25 | Lanthanite-(Nd) | (Nd,La)2(CO3)3 · 8H2O |
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
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External Links:
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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
Localities for Lokkaite-(Y)
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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 | |
| Takai et al. (2010) |
| American Mineralogist: 71 (7-8) |
Miyawaki et al. (2003) | |
Norway | |
| Neumann (1985) |
| Kristiansen (1975) +1 other reference |
| Neumann (1985) |
Sweden | |
| |
| |
USA | |
| Julian Gray |
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Cardiff Uranium Mine, Cardiff Township, Highlands East Township, Haliburton County, Ontario, Canada