Smoky Quartz 10x16mm Faceted Marquise Bead - 15-16 Inch Shape_Pendant which are often accented by

which are often accented by striking matrix patterns in shades of brown

those substances add a delicate accent to the otherwise clear gemstone

Petrified Wood Agate is formed from the petrifaction process of primeval trees over the course of many years

but can be distinguished by its structure and its lower relative hardness

Tourmaline and Pyrite

Smoky Quartz 10x16mm Faceted Marquise Bead - 15-16 Inch Shape_Pendant which are often accented bySmoky Quartz is a translucent smoky brown or gray variety of Quartz. It ranges from almost completely transparent to an almost opaque brownish to gray crystal. The color of Smoky Quartz is due to natural irradiation and traces of aluminum within the crystal lattice of the stone. Smoky Quartz it the national gem of Scotland, where it was mined since around 300 BCE.