This is very strange stuff. Gemmy quartz crystals thinly sliced, slightly offset, and healed... prevailing opinion is that this was done by intergrown wafers of Calcite that interrupted growth, dissolved and gaps healed. Because of transparency, I just cannot do justice to this in a picture, sorry! From the Bor Pit, Dal'negorsk B deposit, Dal'negorsk, Kavalerovo Mining District, Primorskiy Kray.