Rutile
Rutile is a pure natural TiO2 mineral generally containing more than 95% TiO2. It features high temperature resistance, low temperature resistance, corrosion resistance, high strength, small specific gravity, and other excellent properties. It is an important mineral raw material for refining titanium with a relatively small reserve in the earth's crust. As the current global reserve of natural rutile depletes, its production declines year by year. Rutile belongs to the tetragonal crystal system, which often has intact tetragonal columnar or acicular crystal form and aggregates in the form of granular or dense masses. Its color is generally dark red, maroon, yellow, or orange, with iron-rich rutile being black. Rutile streaks are yellow to light brown. It has a diamond-like luster, and iron-rich rutile has a semi-metallic luster. Rutile is brittle, with a hardness of 6-6.5 and a density of 4.2-4.3 g/cm3.
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