Rutile is an accessory mineral found in igneous rock and in metamorphic gneiss and schist. It is an ore of titanium, and is a high-temperature form of titanium dioxide. It has the formulae TiO2 and a relative hardness of 6.5. It exhibits a strong lustre and is often found in twinned crystals. Rutile is found in granite, granite pegmatites, gneiss, micaschist, metamorphic limestone and dolomite. It is present as an accessory mineral in the rocks or in quartz veins. The name rutile is derived from the Latin word 'rutilus' meaning red. Research Rutile
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