Rutilated quartz is a quartz mineral with needle-like inclusions that can vary in thickness, length, pattern and color. The inclusions are composed of a mineral of titanium dioxide called rutile. In the 1940s, miners in Brazil found rutile quartz stones while searching for clear quartz for eyewear. The miners saw no potential in the stone, but when the pieces were shipped to Salvador, jewelers saw the potential in the stone. It has been popular ever since!