mineral
Fluorescent glassy mineral specimen, possibly hyalite opal
Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative
AI-generated identification · may be incorrectTransparent to translucent, colorless, vitreous surface, and apparently amorphous rather than crystalline; hardness about 5.5–6.5 Mohs. Strong blue illumination obscures its normal appearance; hyalite commonly fluoresces vivid green under shortwave UV, whereas ordinary glass may not.
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Physical properties
Transparent to translucent, colorless, vitreous surface, and apparently amorphous rather than crystalline; hardness about 5.5–6.5 Mohs. Strong blue illumination obscures its normal appearance; hyalite commonly fluoresces vivid green under shortwave UV, whereas ordinary glass may not.
Formation & geological history
Hyalite forms as a hydrated silica variety in volcanic cavities and low-temperature veins, commonly associated with rhyolitic rocks; deposits are generally geologically young to Phanerozoic. The pictured rounded, irregular piece could also be shaped or tumbled glass, so identification is uncertain from the image alone.
Uses & applications
Hyalite is mainly a collector specimen and occasional ornamental material; it has little industrial use. If glass, it is a manufactured material rather than a geological specimen.
Geological facts
The image shows a transparent, rounded object under intense blue/UV lighting, with apparent internal flow-like or conchoidal features. A UV fluorescence color, daylight appearance, and scratch or refractive-index tests are needed for confirmation.
Field identification & locations
Check for green fluorescence under shortwave UV, lack of bubbles, natural cavity textures, and hardness greater than ordinary window glass; bubbles and flow lines favor glass. Common hyalite localities include Mexico, Hungary, Italy, and the United States.
