rutile
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Wine-red rutile crystals from Binn Valley, Switzerland
(Size: 2.0 × 1.6 × 0.8 cm). Image source: Wikipedia
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A red-to-black oxide consisting of impure
titanium (IV) oxide (TiO2),
a titanium ore of widespread occurrence. It is used to color porcelain,
and synthetic rutile is used for gems. Related category
GEOLOGY
AND PLANETARY SCIENCE
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