Large Amethyst Venster Quartz Crystal from Brandberg Namibia - Purple/Smoky Hue - Purple Phantom at Termination 16-02-161 Large Amethyst Venster Quartz Crystal from Brandberg Namibia. Crystal has lavender, purple and smoky hue. Purple phantom at termination. Venster impressions and pressure marks. Matrix towards base. Termination has natural unevenness where the two face edges join together at termination. Termination is in terrific condition. Weight 270 g, 7 cm x 6 cm x 4.5 cm