Yugawaralite is a very rare member of the Zeolite Group of minerals, and most people will never even see one at all. This is the gemmiest, most transparent possible quality, and cames from Rock Currier's collection - the man who opened up India to the mineral collecting world in the 1970s and 1980s! This happens to be an exceptionally large, glassy, gemmy, colorless crystal cluster, quality wise the best I can imagine (compared to others from later finds, which are translucent to opaque). This large, sharply formed, thin, tapering prismatic crystal is approximately 4 cm in length, completely transparent and very lustrous - and as you can see from Rock's own notes here, it's quite large for the species! It came out of a small find around the year 1987 from the productive Deccan traps of India. Despite producing tonnage of other species, there have only ever been a few small pockets of this very rare Zeolite species. This is simply a world class example of a very rare species.