KnowraTourmalineLinked fromLinked fromThe 5 pages that link to Tourmaline, each with the reason it gives.All 5Broader topic 3Related 2PegmatiteRelated: Pegmatites produce both gem-quality tourmaline and specimens valued by collectors.PleochroismBroader topic: Many tourmalines show pronounced pleochroism that affects their appearance when cut.Trigonal crystal systemBroader topic: Its elongated crystals display forms compatible with trigonal symmetry.Rhombohedral crystal systemBroader topic: Its varied compositions share crystal symmetry connected to the rhombohedral system.Hair ironRelated: Tourmaline is marketed in some iron coatings, often alongside ceramic.