A very rich specimen comprised of fine, almost gemmy crystals. Ex Dan Ehrling collection of Milwaukee, to me, and then to Jeff in the late 90s. This is as fine a piece for its size as I think you can reasonably expect to own of this rare mineral species. The form of the piece is also aesthetic, as well as rich in the mineral. It probably dates back to the 1940s-1960s. Dan travelled himself to the museum in Rhodesia to make some exchanges in the late 1960s. I cannot say this is from the museum there 100%, but odds are high.