Tourmaline information at mineralminers.com: your on-line link for factual scientific data and mineralogical information concerning natural tourmaline, with links to tourmaline images and photographs of tourmaline crystals, tourmaline gems and tourmaline jewelry designs as well as information on tourmaline mining locations, tourmaline physical properties, tourmaline occurance, tourmaline ...

Tourmalines exhibit various properties, some of which are exceptional. Tourmaline is the name conferred to a group of related minerals which have essentially the same crystal structure. In spite of having same crystal structure, these minerals vary considerably in chemical composition and in some of their physical properties. WinClastour—a Visual Basic program for tourmaline formula calculation and classification. ... and classification of tourmaline chemical ... based on the mineral and mineral-liquid chemistry ...