• Tourmaline is a ring silicate material with a hexagonal crystal structure.
• Tourmaline is a group name applied to the natural silicate minerals of the general
  formula XY3Z6(BO3)3Si6O18(OH)4 where X can be Na or Ca; Y can be substitutions of
  monovalent, divalent, trivalent or quadrivalent cations (Li, Mg, Mn, Fe, Al etc.); and Z
  can be occupied by Al, Mg, Cr, Fe3+, Fe2+, etc. [3,4]. F- or O2- can substitute for OH-.
•  The commonest end-members of tourmaline are: buergerite, dravite, elbaite, liddicoatite,
  schorl and uvite
• Brazil has been a major producer of Tourmaline for decades .
• Zambia has been mining Tourmalines for many years - the most famous mine being Hofmeyer Mine near Nyimba
• Madagascar and Mozambique also have fine Tourmaline deposits.
• Tourmaline has become probably the best selling 'semi-precious' in recent years. This may partly be due to Paloma Picasso's signature range for Tiffany a few years ago
• Green Tourmaline comes in a wide range of shades but the rare Emerald green variety is popularly known as Chrome Tourmaline, which relates to the traces of Chromium, which give this its unique colour

• Abrecht Jewellers News - Pink Tourmaline, Tourmaline (Rubellite) as an alternative to Ruby.
• Gemstone Processing - Tourmalines are a Gem variety that have unique cutting requirements. Blue, Green, Parti-Colored Tourmalines.
• Gem Stone - Processing in USA - Generalized Process Description, Process Waste Streams, Ancillary Hazardous Waste.
• Estimation & Testing - Estimation and Testing of Standard Molar Thermodynamic Properties, crystal Chemistry of Tourmaline, Experimental Data, Estimation of Heat Capacity Functions.
• Laboratory Services - Authenticity and Origin Determination of Natural Gemstones.

• Anisotropy in Tourmaline -  about tourmaline, Investigation of Hardness Anisotropy in Tourmaline
• Buergerite - Structure & Chemistry
• Geochemistry of Tourmaline - Geochemistry of Tourmalines   SEM Analysis
• Fibrous Tourmaline - Complexly Zoned Fibrous Tourmaline, Cruzeiro Mine, Minas Gerais,
  Brazil 
• K-Tourmaline - Discovery of K-Tourmaline in Diamond-Bearing Quartz-Rich Rock from the Kokchetav Massif, Kazakhstan.
• Lehigh County - Tourmaline in Quartz or Pegmatite Veins cutting the gneisses of Lehigh County
• Baraboo Quartzite - Tourmaline-Bearing Quartz veins in the Baraboo Quartzite Wisconsin
• Petrogenetic Indicator - Tourmaline as a Petrogenetic Indicator Mineral
• Tors - Tourmaline on the Formation of Tors on the Dartmoor Granite
• Schorl - Schorl is a Tourmaline Group Mineral.
• Schorl Dravite Series - Tourmaline Structure and Chemistry, Linking Structure and Chemistry in the Schorl - Dravite Series
• Geological Search - Compositional asymmetry in Replacement Tourmaline, Tourmaline Chemistry, Zoning and Replacement
• Serra Do Itaberaba Group - Tourmaline from the Morro Da Pedra Preta Formation.
• Tourmaline Crystal - Complex Zoned Tourmaline in the Diaspore Nodule from a Hydrothermal Kaolin Deposit, Experimental Methods and Results.

• Excavation - Rockhounding in search of Earth's Treasures.
• Exploration of Tourmaline - Application of Ground Penetrating Radar in the Exploration of Gem Tourmaline Pegmatites of Southern California.
• Batalha Mine - Cuprian Elbaite from Batalha Mine.
• Nambia - Project - Erongo Polymetallic Project Sampling
• Mining Tourmaline - Application of Ground Penetrating Radar at Gem Pegmatitie Mine.
• Liddicoatite Tourmaline - Liddicoatite Tourmaline from Madagascar,  Production and Distribution, Processing, Materials and Methods.

• Uniaxial Minerals - Tourmaline a Uniaxial Mineral, Description - Color and Pleochroism, Features.
• Alkaline deficiency Tourmaline - Description and Crystal Structure.
• Tourmaline Crystal - Research and Collection News.
• Indicator - Tourmaline as an Indicator for Provenance in Arkoma Foreland Basin Deltaic Deposits.
• Mineral Sources - Non Metallic Minerals from Tourmaline.
• Paraiba Tourmaline - The Rock Collector - NewsLetter, Praiba Tourmaline- Redefining Blue, World's most colorful Gemstone.
• Usakos Tourmaline Mine - Recent Developments in the Mining and Mineral Industries.

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• Bangkok Gems & Jewellery Magazine
• Exporters - Jiaxin Minerals Processing Factory, Company Details, Products and Services, Other Companies.
• Arkenstone - Mineral Collections - Collecting Fine Minerals from around the World, Online Services.
• Industry - Kenya & Uganda - Production of Mineral Commodities.
• Industry - Maine - Mineral Industry of Maine, Tourmaline is the Official state Mineral.
• Source Guide - Standard Products and Services Listing, Dealers Selection Sample.
• Indian Trade - Traders & Trade Leads 
• Trade Leads - Tourmaline Buyer, Manufacturer, Supplier, Importers & Exporters
• Export Company
• Jagoda Gem Centre - Zambia

• Indian Tourmaline - Green and Blue Tourmaline in India, Different Shapes and their Prices.
• Tourmaline Rocks - Tourmaline-Bearing Rocks in Singhbhum Shear Zone, Eastern India .