1" Extremely Fluorescent Hyalite Opal on Schorl Crystal - Nambia

Extremely Fluorescent Hyalite Opal on Schorl Crystal - Nambia #330859

This is a gorgeous 1" wide black tourmaline (schorl) crystal with hyalite opal along one edge, collected from Erongo Region of Namibia. Under both longwave and shortwave (strongest reaction) UV light, the hyalite opal exhibits a vibrant green fluorescence. The reaction to shortwave UV is a result of trace uranyl ions.

It has been mounted to an acrylic display base with mineral tack.

Hyalite is a transparent to translucent variety of opal that typically bears a globular structure. An amorphous form of silica (SiO2), hyalite opal forms as a volcanic sublimate in volcanic or pegmatic rock and is thereby considered a mineraloid. It can be referred to as water opal, jalite, or even Muller's glass, named after the man who discovered it, Franz-Joseph Müller von Reichenstein. It has a hardness of 5.5–6 on the Mohs scale and exhibits conchoidal fracturing.

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