I have never seen a crystal like this before! It is a smoky cluster with a very clear inner core of clear and milky quartz that is coated with green/blue deposits - the mineral is not known, but it might be some form of copper or chlorite. These are enclosed in clear quartz, which in turn bears traces of brown/plum surface deposits. This makes this a manifestation cluster, and it may be of interest to he collector, as well as those involved with deep healing work that involves going within.
Size 6 x 5 x 3.5 cm