Kimuraite-(Y)
A valid IMA mineral species
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About Kimuraite-(Y)
Professor Kenjiro Kimura (1896-1988)
Formula:
Ca(Y,Nd)2(CO3)4 · 6H2O
Colour:
pale purple, light pink, white
Lustre:
Vitreous, Silky
Hardness:
2½
Specific Gravity:
2.6
Crystal System:
Orthorhombic
Member of:
Name:
For professor Kenjiro Kimura (1896-1988), Tokyo University.
Type Locality:
This page provides mineralogical data about Kimuraite-(Y).
Unique Identifiers
Mindat ID:
2208
Long-form identifier:
mindat:1:1:2208:4
GUID
(UUID V4):
(UUID V4):
2ca61731-7fa8-45b3-a49e-f413995d796b
IMA Classification of Kimuraite-(Y)
Approved
IMA Formula:
CaY2(CO3)4 · 6H2O
Approval year:
1984
Type description reference:
Classification of Kimuraite-(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)
15.4.5.1
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
11.8.10
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 |
|---|---|---|
| Kmu-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 Kimuraite-(Y)
Vitreous, Silky
Transparency:
Translucent
Comment:
Silky on cleavages
Colour:
pale purple, light pink, white
Streak:
white
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
on {010}
on {010}
Density:
2.6(1) g/cm3 (Measured) 2.98 g/cm3 (Calculated)
Optical Data of Kimuraite-(Y)
Type:
Biaxial (-)
RI values:
nα = 1.584(2) nβ = 1.612(2) nγ = 1.626(2)
2V:
Measured: 70° (5), Calculated: 68°
Max Birefringence:
δ = 0.042
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:
small
Chemistry of Kimuraite-(Y)
Mindat Formula:
Ca(Y,Nd)2(CO3)4 · 6H2O
Crystallography of Kimuraite-(Y)
Crystal System:
Orthorhombic
Cell Parameters:
a = 9.2545(8) Å, b = 23.976(4) Å, c = 6.0433(7) Å
Ratio:
a:b:c = 0.386 : 1 : 0.252
Unit Cell V:
1,340.92 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Spherulitic aggregates of scaly tabular crystals.
Comment:
Point Group: 2/m 2/m 2/m, mm2, or 222.;Space Group: Immm, Imm2, I212121, or I222.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 12.06 Å | (100) |
| 6.02 Å | (40) |
| 3.76 Å | (30) |
| 5.93 Å | (20) |
| 4.01 Å | (20) |
| 2.05 Å | (12) |
| 4.87 Å | (10) |
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 Kimuraite-(Y)
Place of Conservation of Type Material:
National Science Museum, Tokyo, Japan, M-24513; National Museum of Natural History, Washington, D.C., USA, 164269.
Geological Setting of Type Material:
Fissues in alkali olivine basalt
Associated Minerals at Type Locality:
Reference:
NAGASHIMA, K., MIYAWAKI, R., TAKASE, J., NAKAI, I., SAKURAI, K., MATSUBARA, S., KATO, A. AND 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, 1028-1033.
Synonyms of Kimuraite-(Y)
Other Language Names for Kimuraite-(Y)
Relationship of Kimuraite-(Y) to other Species
Member of:
Other Members of this group:
| Hizenite-(Y) | Ca2Y6(CO3)11 · 14H2O | Orth. |
| Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O | 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 Kimuraite-(Y) associated with Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O |
| 3 photos of Kimuraite-(Y) associated with Thalénite-(Y) | Y3Si3O10F |
| 3 photos of Kimuraite-(Y) associated with Allanite-(Y) | (CaY)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 3 photos of Kimuraite-(Y) associated with Lanthanite-(Nd) | (Nd,La)2(CO3)3 · 8H2O |
| 2 photos of Kimuraite-(Y) associated with Kozoite-(Nd) | (Nd,La,Sm,Pr)(CO3)(OH) |
| 2 photos of Kimuraite-(Y) associated with Actinolite | ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 |
| 2 photos of Kimuraite-(Y) associated with Lanthanite |
Related Minerals - Strunz-mindat Grouping
| 5.CC. | Alicewilsonite-(YCe) | Na2Sr2YCe(CO3)6 · 3H2O |
| 5.CC. | Alicewilsonite-(YLa) | Na2Sr2YLa(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 | Bainbridgeite-(YCe) | Na2Ba2YCe(CO3)6 · 3H2O |
| 5.CC.10 | Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 5.CC.15 | Lokkaite-(Y) | Ca(Y,Gd,Nd,Dy)4(CO3)7 · 9H2O |
| 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 |
Fluorescence of Kimuraite-(Y)
Bright reddish purple to purple under SW and LW
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 Kimuraite-(Y)
mindat.org URL:
https://www.mindat.org/min-2208.html
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Please feel free to link to this page.
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References for Kimuraite-(Y)
Reference List:
Localities for Kimuraite-(Y)
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.
Australia | |
| R Bottrill |
Canada | |
| R. Tibbit +1 other reference |
Chile | |
| Färber (n.d.) |
Japan (TL) | |
| Nagashima et al. (1986) |
| Miyawaki et al. (2003) | |
| Miyawaki et al. (2000) | |
Norway | |
| Husdal (2019) |
Russia | |
| V.V. Seredin data |
Sweden | |
| Mikael Janssons Collection +1 other reference |
| |
| Pavel.M. Kartashov (n.d.) |
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Kirigo, Hizen-cho, Karatsu City, Saga Prefecture, Japan