Black Rutilated Quartz 5x8mm Chip - 15-16 Inch Shape_Cross currently believed to be due

currently believed to be due to the presence of a copper-based mineral such as Malachite or Azurite

calcium and aluminum with trace amounts of iron

The yellowish colors of heliodor are usually caused by small amounts of iron within the mineral's crystal structure

” the other being Nephrite

Black Rutilated Quartz 5x8mm Chip - 15-16 Inch Shape_Cross currently believed to be dueRutilated 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