Black Rutilated Quartz 7x8mm Faceted Swirl Oval - 15-16 Inch White Wood this opal variety is characterized

this opal variety is characterized by their dark base tone

features intricate light brown patterns on dark brown stones

It may also be called Rocky Butte Picture Jasper

Additionally

brown and orange

Black Rutilated Quartz 7x8mm Faceted Swirl Oval - 15-16 Inch White Wood this opal variety is characterizedRutilated Quartz is a silicon dioxide mineral with unique needle like inclusions of Rutile. These needles usually appear golden, but can also appear silver, red, copper, or black and can be distributed randomly or in bundles or star like formations. Rutile is the mineral name for natural crystals of titanium dioxide, which may contain iron oxide. When the level of iron oxide is high, the inclusions appear more golden or copper, when it is low, they