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A mineral that is reddish-brown to red, sometimes yellowish, and has a brilliant lustre. It is sometimes found as a needle-like inclusion in some gemstones, e.g. Sagenitic quartz and sagenite. Some transparent specimens are used in jewelry, occasionally being faceted or, when opaque, cut en cabochon. A synthetic rutile was developed in 1948.
From: An Illustrated Dictionary of Jewelry, autor: Harold Newman, publishers: Thames and Hudson