Rutile
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Rutile is an oxide mineral composed of titanium dioxide, and is the most common natural form of TiO2. Rarer polymorphs of TiO2 are known, including anatase, akaogiite, and brookite.
Rutile ww 7a
Rutile in quartz
Milled rutile
Acicular crystals of rutile protruding from a quartz crystal
Anatase
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Anatase is a metastable mineral form of titanium dioxide with a tetragonal crystal structure. Although colorless or white when pure, anatase in nature is usually a black solid due to impurities. Three
Rutile
…is an oxide mineral composed of titanium dioxide (TiO2), and is the most common natural form of TiO2. Rarer polymorphs of TiO2 are known, including anatase, akaogiite, and brookite. Rutile has one of the highest refractive indices at visible wavelengths of any known crystal and also exhibits a particularly…
Anatase Oisans
Black anatase crystals on smoky quartz