Database of luminescent minerals 

HOWLITE

Chemical formula: Ca₂B₅SiO₉(OH)₅

Family: Borates

Status: IMA-GP

Crystal system : Monoclinic

Display mineral: NON

Luminescence:

Do you have a photo of this mineral you would like to see in the gallery? Contact us!

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

No data

Activator(s) and spectrum:

Activator(s): Eu²⁺,

Peaks in the spectrum (nm):

Eu²⁺ repl. Ca²⁺ : 425nm

No spectrum yet

Comments on spectrum and activators:

Sky-blue under LW weaker under SW: activator: Eu2+;

Best localities for fluorescence (*):

• Lang Mine, Tick Canyon Borate deposit, Tick Canyon, Lang, Los Angeles Co., California, USA (orange LW, nothing SW or blu LW, weaker 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 ,
• Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
• Handbook of Fluorescent Gems and Minerals, a practical guide for the gem and mineral collector, Jack de Ment, 1949 ,

Mineralogical reference on the Internet:

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

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

Internet Search:

  Image search on 'Google Images'

  Search for documents in all languages on Google

  Search on Wikipedia