Fluo-Phos-Therm Fluorite from the Globe Mine (Rio Arriba)

This kind of fluorite was well described by Robbins (1984). “...This material is opaque, and greenish or gray in daylight. Under long wave, the fluorescence is violet. Under short wave, the fluorescence is a surprising and intense canary yellow, and both wavelengths produce greenish phosphorescence....” The yellow fluorescence is probably due to dysprosium (Robbins 1994).

But what Robbins omitted is that this fluorite is Thermoluminescent too.

Thermoluminescence is green and become yellow as the temperature rise again.

Thermoluminescence is reversible and some temperature cycles don’t destroy fluorescence if temperature doesn't rise too much.

Origin: Globe Mine, Petaca District, Rio Arriba Co. New Mexico, USA

Dimension: 4.3 x 2.6 x 1.9 cm

Weight: 30g

Questa varietà di fluorite è stata ben descritta da Robbins (1984). “... Questo materiale è opaco, verdastro o grigio alla luce naturale. La fluorescenza in onda lunga è violetta mentre è di un sorprendente giallo-canarino in onda corta. Entrambe le lunghezze d’onda producono fosforescenza verde....” La fluorescenza gialla è probabilmente dovuta al disprosio (Robbins 1994).

Ma quello che Robbins non ha menzionato è che questa fluorite è anche termoluminescente.

Il colore della termoluminescenza è verde e diventa giallo se la temperatura sale ulteriormente.

La termoluminescenza è reversibile ed alcuni cicli (caldo/freddo) non compromettono la fluorescenza a patto di non esagerare con la temperatura.

Overview . The small pieces are usefull to test Thermoluminescence....

Short Wave

Long Wave

Phosphorescence

Thermoluminescence: Macro of four small pieces.... the yellow one is hotter than the others

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