A superb old specimen showing classic twinning of the harmotome crystals as originally described for the species by the old German mineralogists, and shown in very old mineral prints. These specimens are admittedly somewhat exotic in terms of appreciation to non-German specialists, but are none the less desirable for the species because of the unusually well-pronounced twinning and, as well, remain a very rare old classic.....as you'd expect from the German suite of this particular collection, which was clearly its pride and joy