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1. en.wikipedia.org › wiki › TourmalineTourmaline - Wikipedia

   en.wikipedia.org › wiki › Tourmaline

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   Tourmaline is a gemstone that comes in a wide variety of colors and has pyroelectric properties. It is composed of boron, aluminium, iron, magnesium, sodium, lithium, or potassium and has different species and varieties depending on its color and composition.

2. geologyscience.com › minerals › tourmalineTourmaline | Properties, Formation, Occurrence - Geology Science

   geologyscience.com › minerals › tourmaline

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   1 Ιουλ 2024 · Tourmaline is a gemstone with a wide range of colors and unique properties. It is a complex borosilicate mineral that forms prismatic crystals and exhibits pleochroism, pyroelectricity, and piezoelectricity.

3. www.gia.edu › tourmalineWhat Is Tourmaline Gemstone | Tourmaline Stone - GIA

   www.gia.edu › tourmaline

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   Tourmaline is a gemstone with a wide range of colors and varieties, from green to pink to blue. Learn about its history, lore, treatments, and how to identify its quality factors such as color, clarity, cut, and carat weight.

4. geology.com › minerals › tourmalineTourmaline: Earth's most colorful mineral and gemstone -...

   geology.com › minerals › tourmaline

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   Tourmaline is a group of boron silicate minerals that vary in color and composition. It is a popular gemstone and a mineral specimen, with many sources around the world, especially Brazil.

5. rockseeker.com › tourmalineTourmaline: Ultimate Guide To Tourmaline (What It Is and Where To...

   rockseeker.com › tourmaline

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   26 Ιουλ 2022 · Learn about tourmaline, a group of boron silicate minerals that occur in various colors and are pyroelectric. Discover the different types of tourmaline, their properties, and where to find them in the world.

6. www.minerals.net › gemstone › tourmaline_gemstoneThe Gemstone Tourmaline - The Mineral and Gemstone Kingdom

   www.minerals.net › gemstone › tourmaline_gemstone

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   Tourmaline is the most colorful of all gemstones. It occurs in all colors, but pink, red, green, blue and multicolored are its most well-known gem colors. Scientifically, tourmaline is not a single mineral, but a group of minerals related in their physical and chemical properties.

7. www.gia.edu › tourmaline-descriptionTourmaline Description - GIA

   www.gia.edu › tourmaline-description

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   Learn about tourmaline, a gemstone with a wide range of colors and properties. Discover its chemical composition, crystal structure, color varieties, and sources.