Rutilated quartz. Rutilated quartz, also known as sagenitic quartz, occurs when acicular crystals of rutile (titanium dioxide, dark) are enclosed in q

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Rutilated quartz. Rutilated quartz, also known as sagenitic quartz, occurs when acicular crystals of rutile (titanium dioxide, dark) are enclosed in quartz (silicon dioxide, clear). Here, the quartz crystal has a hexagonal rhombohedral trapezohedral shape. Rutile is a major ore of the metal titanium.

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Photo credit: © DIRK WIERSMA/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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