EUCRYPTITE
Chemical Formula: LiAlSiO4
Familly: Silicates
Status: IMA-GP
Crystal System: Rhomboedric
Mineral for Display: No
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Short Waves (254 nm): | Red | | | | | | |
Daylight Picture
EUCRYPTITE, Midnight Owl Mine, Yavapai County, Arizona, USA
Photo and Copyright: James Horste
Used with permission of the author.
Short Waves Pictures (254nm)
EUCRYPTITE UVSW, Midnight Owl Mine, Yavapai County, Arizona, USA
Photo and Copyright: James Horste
Used with permission of the author.
Phosphorescence (in the common meaning of the term) seen by 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.
Main Activator(s) and spectrum:
Most Common Activator:
Peaks in the spectrum (nm):
685,7nm
Col. G. Barmarin; Spectre: G. Barmarin
Best Locality for luminescence(*):
- 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;
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Bibliographical 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 ,
Luminescence Reference on internet:
- EUCRYPTITE FROM BIKITA, SOUTHERN RHODESIA, THE AMERICAN MINERALOGIST, VOL. 47, MAY-JUNE, 19621 Cornelius S. Hurlbut Jr
- EUCRYPTITE AND BIKITAITE FROM KINGS MOUNTAIN, NORTH CAROLINA, THE AMERICAN MINERAGOGIST, V0L. 53, JULY_AUGUST, 1968, Peter B. Leavens, C. S. Hurlbut Jr., Joseph A. Nelen
- Structure of the eucryptite, K.F. Hesse, 1985
Images:
- Bikita pegmatite, Zimbabwe: http://www.mindat.org/photo-151844.html
- Harding Mine, New Mexico, USA: http://www.mindat.org/photo-671108.html
- Harding Mine, New Mexico, USA: http://www.mindat.org/photo-225806.html
- Fillow Quarry, Connecticut, USA: http://www.mindat.org/photo-350477.html
- Fillow Quarry, Connecticut, USA: http://www.mindat.org/photo-387928.html
- Fillow Quarry, Connecticut, USA: http://www.mindat.org/photo-389756.html
- Fillow Quarry, Connecticut, USA: http://www.mindat.org/photo-392139.html
- Fillow Quarry, Connecticut, USA: http://www.mindat.org/photo-392141.html
- Parker Mountain Mine, New Hampshire, USA: http://www.mindat.org/photo-350722.html
- Parker Mountain Mine, New Hampshire, USA: http://www.mindat.org/photo-362630.html
- Parker Mountain Mine, New Hampshire, USA: http://www.mindat.org/photo-468538.html
- Midnight Owl Mine, Arizona, USA: http://www.mindat.org/photo-433256.html
- Londonderry Li deposit, Australia: http://www.mindat.org/photo-276786.html
- Londonderry Li deposit, Australia: http://www.mindat.org/photo-641918.html
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Eucryptite
http://webmineral.com/data/Eucryptite.shtml
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