A very fine prismatic twin, from the classic locality that has produced these wonderful examples considered best of this particular habit. The three dimensional aspect, combined with the glassy surfaces and super-sharp angles, elevate this specimen's importance significantly. Few of this size were found and they commanded high prices in the late 1990s when they came out. Many of the larger ones needed repairs, and there is one neat repair about 1/3 of the way from the top, where a cleavage occurred (horizontally) and was perfectly and nearly seamlessly rejoined. This crystal is large, super sharp and lustrous, hard to find today in this material.