Black Rutilated Quartz 10mm Round - 15-16 Inch R0471 creating veins and mottling that

creating veins and mottling that ranges in color from rust to black

where it was mined since around 300 BCE

However in some regions

Australian Green Opal is a variety of Common Opal which is a mixture of Opal and nontronite

Black Rutilated Quartz 10mm Round - 15-16 Inch R0471 creating veins and mottling thatRutilated 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