| 21. | This is observable for example in the case of tourmalines from Czech pegmatites.
|
| 22. | "That's tourmaline ."
|
| 23. | The little tourmaline was surrounded by flecks of shiny mica and grains of garnet.
|
| 24. | Jewelers are pushing necklaces of tourmaline, a stone believed to release negative ions.
|
| 25. | Around 2005, beautiful crystals of copper-containing tourmaline were found in Mozambique.
|
| 26. | Alunite, topaz, zunyite, tourmaline, enargite and tennantite may also occur.
|
| 27. | :: The ioniser is likely pyroelectric tourmaline.
|
| 28. | Margaret then notes that there are tourmaline-bearing and beryl-bearing pegmatites.
|
| 29. | Unusual minerals found in the volcanics include andalusite, muscovite, sillimanite and tourmaline.
|
| 30. | The pink color of tourmalines from many fields is the result of prolonged natural irradiation.
|
