Workgroup    Fluorescence
Carbonates - Nitrates
Cerussite, Touissit, Touissit District, Jerada Province, Eastern Region, Morocco.
The fluorescence is very similar to that of barite with monovalent silver as activator. It is thought that silver is the cause, but a direct link is not yet demonstrated.
Rhodochrosite, Cavnic, Marmures Co, Romania.
The red fluorescence is similar to that of calcite-Mn. Gorobets states that the cause is intrinsic. Nevertheless not all rhodochrosite fluoresces.
Long wave UV
 
 
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Weloganite: Francon quarry, Montréal, Québec, Canada

Long wave UV
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Cerussite, Touissit, Touissit District, Jerada Province, Eastern Region, Morocco.

This fluorescence was photographed in violet laser light of 405 nm with diverging beam. A special filter was used to remove all light with wavelengths shorter than 415 nanometers. As a result, this image shows absolutely nothing else than the fluorescence of the mineral. All reflections and background scattering have been filtered out. Both halogen and laser photos are stacks of 30 images.
Halogen light and 405 nm laser light resp.
Halogen light and 405 nm laser light resp.
Dolomite, La Union, Murcia, Spain.

Dolomite is not mentioned in the  "inventory" of this locality but the somewhat curved faces of the crystals point to dolomite, rather than calcite. There are also some quartz crystals on the specimen.
This fluorescence was photographed in violet laser light of 405 nm with diverging beam. Some of the matrix fluoresces weakly in greyish hues, which adds some depth to the photo. The activator is Mn2+ with lead as a co-activator.
 
 
Halogen light and 365 nm Convoy S2+ resp.
Smithsonite
Vieille Montagne (Altenberg; Kelmisberg), Kelmis (La Calamine), Plombières-                                          Vieille Montagne-Moresnet (Plombières-Altenberg-Moresnet) mining district, Verviers, Liège Province, Belgium
Initially there was soe doubt about the identification of this specimen, because of the fluorescence that is very similar to that of manganese-activated calcite. An emission spectrum and the specimen's reaction to acid provided clarity. The specimen behaves astoundingly similar to smithsonite from Mexico. See the spectral analisys for more detail.
Collection: François Wouters
Photo: Axel Emmermann
Click photo
Dolomite, La Union, Murcia, Spain.

A "hopper" skeleton-crystal of which only the edges are visible. The cavities are filled with hardened clay. The cause of the fluorescence has not been established. Unfortunately, the specimen perished during examination. What we won't do for science...
White light and UV LED's 380 nm
 
Copyright © 2014 by Axel Emmermann  ·  All Rights reserved  ·  E-Mail: fluorescentie@minerant.org
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