What defines rutilated quartz?

Rutilated quartz is specifically characterized by the presence of needle-like inclusions of rutile, which is a mineral composed primarily of titanium dioxide. These needle-like inclusions can exhibit various colors, typically golden or red-brown, and are what give rutilated quartz its unique appearance and appeal. The quality, density, and color of the rutile inclusions can significantly influence the aesthetic value of the stone. This defining characteristic sets rutilated quartz apart from other varieties of quartz, particularly clear quartz, which is free from inclusions and does not possess the stunning visual depth that the rutile lends.

Unlike colored variants of quartz, which derive their hues from different trace elements or mineral content, rutilated quartz is specifically identified by its inclusion pattern rather than its base color. The option referring to a type of crystal known for its large size does not apply, as rutilated quartz can vary significantly in size without the inclusions being tied to such a characteristic.