This quartz is from China. Quartz is a silicate that contains the elements Si and O. When in pure form quartz is clear and colorless. It comes in a variety of colors which are caused by trace elements in the crystal lattice. This is a natural citrine crystal with smokey quartz phantoms or a smokey quartz crystal with a citrine phanthoms. Three of the six sides have a glass luster and three have striated and lightly etched surfaces. The termination is elongated, chisel shaped, with five sides. It measures 2 1/8 x 13/16 x 3/4 inches or 55 x 20 x 19 mm.