When the two stones are rubbed together in a darkened room, a white light is visible at the point of contact. The effect is known as triboluminescence. The stone is most commonly known as white-veined or milky quartz. The product was supplied by Tobar Ltd, Harleston, IP20 0PJ, England.
“Glowstones” – a mineral which exhibits triboluminescence
Item Details
| Size | The shrink wrapped blue card is 105 x 115mm. |
|---|---|
| Date | Circa 2000 |
| Organisations | Tobar |
| Key Phrases | Novelties |
| Category | Novelties, Toys, Games & Jokes |
| Ref no | N2422 |