Database of luminescent minerals 

KIMURAITE-(Y)

Chemical formula: CaY₂(CO₃)₄ 6H₂O

Family: Carbonates

Status: IMA-A

Crystal system : Orthorhombic

Display mineral: NON

Luminescence:

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No data

Activator(s) and spectrum:

Activator(s): Eu³⁺, Dy³⁺,  Tb³⁺,  Gd³⁺,  

Peaks in the spectrum (nm):

Eu(III): Ex. 395 nm (7F6→5L6)/Em. 615 nm (5D0→7F2);

Tb(III): Ex. 380 nm (7F6→5D3)/Em. 545 nm (5D4→7F5);

Gd(III): Ex. 275 nm (8S7/2→ 6D3/2)/Em. 312 nm (6P7/2→8S7/2);

Dy(III): Ex. 352 nm/Em. 575 nm (4F9/2→6H13/2)

No spectrum yet

Comments on spectrum and activators:

The strongly reddish-purple fluorescence of the mineral under ultraviolet light was found to depend on the following fluorescent rare-earth(III)ions. Eu(III), Tb(III), Dy(III), and Gd(III). These rare-earth(III)ions in the mineral showed many sharp excitation and emission bands. The bands of the luminescence of Kimuraite could be attributed to the f-f allowed transition of Eu(III): Ex. 395 nm (7F6→5L6)/Em. 615 nm (5D0→7F2); Tb(III): Ex. 380 nm (7F6→5D3)/Em. 545 nm (5D4→7F5); Gd(III): Ex. 275 nm (8S7/2→ 6D3/2)/Em. 312 nm (6P7/2→8S7/2);Dy(III): Ex. 352 nm/Em. 575 nm (4F9/2→6H13/2), respectively. (see bibliography)

Best localities for fluorescence (*):

• Kirigo, Hizen-cho, Higashi-Matsuura-gun, Saga, Kyushu Island, Japan ;

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Kimuraite-(y)

  http://webmineral.com/data/Kimuraite-(y).shtml

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