I am not sure if I can call this a pseudomorph or not?! It looks more like a biological infestation run amok, but it IS an alteration, somehow; and so I imagine this IS an alteration-pseudomorph. Perhaps 90% of the original inyoite has been here altered to meyerhofferite, so that the crystals are inyoite only in the minute spaces between the meyerhofferite, and at their bases (seems to have been an alteration starting in the top and outer layers of the crystals). You can tell even by the heft of the piece, that it is different, and almost completely altered. The appearance is bizarre and actually quite mesmerizing, like no pseudo I can recall seeing because of the minute and discrete meyerhofferite crystals that together make up the replacement. I am told by several people familiar with the Boron meyerhofferites that this is likely the best meyerhofferite pseudo around.