ERN05A Quartz var. Amethyst
A nice example of a Goboboseb amethyst on matrix. These are usually referred to as "Brandberg" amethyst, though in actuality nothing comes from there-- Brandberg is a protected reserve. Most "Brandbergs" come from the Goboboseb Range-- specifically Tafelkop and the surrounding hills, most within sight of Brandberg itself.
This one is on matrix-- there are just a handful of local dealers who have invested in the tools to be able to cut these things out of the surrounding rock-- the majority however still com from small claims mined with hand tools, that is why most pieces have no matrix.