A beautiful sample of rhodizite-londonite, with a single pseudo octahedral crystal on matrix. It is not at all unusual to find these crystals on matrix, but to see them on a matrix that is so (comparatively) pretty and well crystallized is highly unusual.
Since I have received this question a couple times, I will answer it in advance: I label them as "rhodizite-londinite" because they have not been tested, and my sense of smell (joke) is not good enough to determine precisely which end-member is present on the specimen.....