Database of luminescent minerals 

youngite

Chemical formula: See calcedoine

Family: Oxides and hydroxides

Status: NON APPR

Crystal system : Polycrystalline

Display mineral: OUI

Luminescence:

Daylight picture

youngite,Photo and Copyright: Paul Garland
Pictures on Flickr:
http://www.flickr.com/groups/fluorescent-minerals/pool/55922094@N00/
Used with permission of the author

Shortwave (254nm) picture

youngite under UVSW,Photo and Copyright: Paul Garland
Pictures on Flickr:
http://www.flickr.com/groups/fluorescent-minerals/pool/55922094@N00/
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:

Youngite is a local name applied to brecciated chalcedony-jasper rocks covered by druzy quartz crystals. It is found in natural caves and veins in Mississippian limestone near Glendo and Guernsey reservoirs in Platte County, Wyoming, USA.

Youngite consists of red, yellow, chocolate, lilac, peach, gold, cream, orange, and purple jasper fragments within a matrix of off-white to grayish-blue chalcedony.

Activator(s) and spectrum:

Activator(s): (UO₂)²⁺ (ion Uranyle) en impureté,

Peaks in the spectrum (nm):

UO₂²⁺ : 499nm, 522nm, 544nm

567, 594, 601nm (?) 

Col. G. Barmarin; Spectre: G. Barmarin

Best localities for fluorescence (*):

• Mississippian limestone near Glendo and Guernsey reservoirs in Hartville District, Platte Co., Wyoming, USA;

(*)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 ,

Mineralogical reference on the Internet:

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

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

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