DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
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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