Smoky spirit quartz cluster

This is a high quality smokey Spirit Quartz cluster from Boekenhouthoek, South Africa. Most spirit quartz is found in light purples, yellow citrines or white. The rarest kinds found to date are deep purple, and even rarer still, smoky, almost black spirit quartz. This piece measures  approximately 12.7 cm x 12 cm x 6.3 cm and weighs 930g.