From the TYPE LOCALITY (1871), this specimen was already in a collection by 1875 and we could safely, I think, assume it is, from style and from the dating, from the first finds here at this locality - still known for having produced the best of the species known to date. This is a particularly large crystal for the species, 7 mm in size, and quite robust. It was luckily protected inside a 3-dimensional vug.