Rutile (a black, yellowish, or reddish-brown mineral, found in igneous rocks, metamorphosed limestones, and quartz veins. It is a source of titanium. Composition: titanium dioxide. Formula: TiO2. Crystal structure: tetragonal. Via French
Rutile Value, Price, and Jewelry Information - International Gem Society
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Rutile with old European label - D16-30 - Graves Mountain - USA Mineral Specimen
Minerals Rutile Golden IN Sprays On Hematite Brazil Brasil | eBay