Database of luminescent minerals 

WALSTROMITE

Chemical formula: BaCa₂Si₃O₉

Family: Silicates

Status: IMA-A

Crystal system : Triclinic

Display mineral: NON

Luminescence:

Daylight picture

WALSTROMITE & CELSIAN,
From the Esquire No. 8 claim, Big Creek, CA USA
Photo and Copyright: Cran Cowan
Used with permission of the author;

Longwave (365nm) picture

WALSTROMITE (not fluo) & CELSIAN (blue), UVLW
From the Esquire No. 8 claim, Big Creek, CA USA
Photo and Copyright: Cran Cowan
Used with permission of the author;

Midwave (330nm) picture

WALSTROMITE (orange) & CELSIAN (blue), UVMW
From the Esquire No. 8 claim, Big Creek, CA USA
Photo and Copyright: Cran Cowan
Used with permission of the author;

Shortwave (254nm) picture

WALSTROMITE (orange) & CELSIAN (blue), UVSW
From the Esquire No. 8 claim, Big Creek, CA USA
Photo and Copyright: Cran Cowan
Used with permission of the author;

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

Comments:

Barium analogue of MARGAROSANITE

Activator(s) and spectrum:

Activator(s): Mn²⁺ , Eu²⁺,  Nd³⁺,  Tm³⁺,  

Peaks in the spectrum (nm):

• Mn²⁺ : large peak at 590 - 591 - 595nm (FWMH 50nm)
• Tm³⁺ : 450, 459nm
• Eu²⁺ : 480nm
• Nd³⁺ : 808, 858, 878, 887, 896, 914, 925nm (exc 780nm)

Comments on spectrum and activators:

Time-resolved luminescence spectra are characterized by Tm³⁺, Eu²⁺ and Mn²⁺ centers (Gaft et al. 2013).

Excitation by CW laser with 532 and 785 nm revealed several luminescence bands and lines supposedly connected to Mn²⁺ and Nd³⁺

Best localities for fluorescence (*):

• Cat head mountains, Big Creek-Rush Creek area, Fresno County, California, USA (bright orange MW);
• Esquire No. 8 claim (Landers Gillespite locality), Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA (Bright yellow-orange MW);
• Snow Cap Mine, Rush Creek, Rush Creek deposit, Big Creek-Rush Creek Mining District, Fresno Co., California, USA (pink LW & SW);

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

Bibliographic reference for luminescence:

• The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
• Fluorescence: Gems and Minerals Under Ultraviolet Light, Manuel Robbins, 1994, Geoscience Press, ISBN 0-945005-13-X ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Walstromite

  http://webmineral.com/data/Walstromite.shtml

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