This is a large cluster of smoky quartz crystals from Brazil. The entire plate is 13.4 inches long and the longest point is just over 4 inches long. Many of the crystals have chipping or breakage to them, however there are some that are in excellent condition.
is a grey-brown to black variety of quartz. This common name is derived from from the appearance of smoke within the quartz crystal. Dependent on the location and the chemicals present during formation, smoky quartz can appear opaque black, however it’s typically translucent to some extent. It’s believed that the quartz gains this color from a combination of natural irradiation and aluminum impurities.