Database of luminescent minerals 

EUCRYPTITE

Chemical formula: LiAlSiO₄

Family: Silicates

Status: IMA-GP

Crystal system : Rhomboedric

Display mineral: NON

Luminescence:

Daylight picture

EUCRYPTITE, Midnight Owl Mine, Yavapai County, Arizona, USA

Photo and Copyright: James Horste
Used with permission of the author.

Shortwave (254nm) picture

EUCRYPTITE UVSW, Midnight Owl Mine, Yavapai County, Arizona, USA
Photo and Copyright: James Horste
Used with permission of the author.

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

No data

Comments:

The outermost portion of the samples are generally not luminescent.
Eucryptite is sostructural with Phenakite and willemite. The Al and Si atoms of eucryptite are disordered in the sites equivalent to the Be and Zn in phenakite and willemite and the Li atoms of eucryptite occupy the sites equivalent to the Si positions in phenakite and willemite.

Activator(s) and spectrum:

No data

Peaks in the spectrum (nm):

685,7nm

Col. G. Barmarin; Spectre: G. Barmarin

Best localities for fluorescence (*):

• Midnight (Midnite?) Howl Mine, White Picacho district, Maricopa county, Arizona, USA;
• Midnight Owl Mine, Independence Gulch, White Picacho District, Yavapai Co., Arizona, USA;
• Bikita, Masvingo Distrikt, Zimbabwe;
• Harding Mine, Picuris District, Taos Co., New Mexico, USA;
• Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield Co., Connecticut, USA;
• Parker Mountain Mine, Parker Mountain, Strafford, Strafford Co., New Hampshire, USA;
• Tanco Mine, Bernic Lake, Lac-du-Bonnet area, Manitoba, Canada (medium red SW);
• Londonderry Li deposit, Nepean, Coolgardie Shire, Western Australia, Australia (pink LW, red SW);
• Xianghualing Mine (Hsianghualing Mine), Xianghualing Sn-polymetallic ore field, Linwu Co., Chenzhou Prefecture, Hunan Province, China;
• Yichun Mine (Mine No. 414), Yichun complex (Yashan batholith), Yuanzhou District, Yichun Prefecture, Jiangxi Province, China;

(*)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=Eucryptite

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

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