Rutile: mineral with the chemical formula TiO2 (Titanium Dioxide). Ranges from transparent to opaque, with a luster from adamantine to metallic and colors from yellow to brown, as well as colorless, red, and black. It crystallizes in the Tetragonal System and appears in elongated prismatic or acicular crystals, often twinned or poly-twinned. Aggregates are granular and opaque. Found in various types of rocks.
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IGR – Rivista Italiana di Gemmologia, the Italian Gemological Review, is the leading International Gemological Magazine in Italy masterminded by Gem-Tech Gemological Institute, a broad information framework for Gemologists as well as professionals involved daily in the gemstone business.
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