Amethyst

In game description: "Not the one from the TV show, the ore itself. This can be found very low in the Martian quarry and is very valuable."

Amethyst is an uncommon ore that is found throughout the majority of the Martian quarry. Amethyst gives off a purple glow and has a very dark purple pigmentation. Amethyst has a very similar color and glow to Rose Quartz which can make it easy to confuse the two ores with one another.