Quartz "half-scepter" with smoky and amethyst ...

Description: Quartz "half-scepter" with smoky and amethyst phantoms, from Goboboseb, Namibia, 6.2 x 2.3 x 1.9 cm. Ex. C. Key Collection. I'm following John's "scepters" thread trying to figure out what conditions would exist to create a crystal like this...