This is a large cluster of dark black, smoky quartz crystals from Brazil. The entire plate is 11.6 inches wide and the longest point is over 5 inches long. The crystals on the specimen are quite large, just about all of which are chip free. The smoky-black coloration goes all the way down to the granite matrix. It has not been heated or treated to change the natural color.
www.fossilera.com/minerals/hu-10-4-smoky-quartz-cluster-with-calcite-brazil
