I am confused. I thought the red beryl was called simply "red tabular beryl" after its' form. The black cubes from the area are called bixbyite. I collected there more than 20 years ago and my remembered names may be wrong. Steve Ramsdell
Steve, there’s a minor spelling difference. Red beryl is "bixbite."
The shiny black cubic iron manganese oxide crystals found in the Utah
topaz deposits are “bixbyite.” They don’t make this easy, do they?
If I recall correctly (and don’t hold me to this!) I think both
minerals were named after the same person, so they had to make a
spelling distinction between the two.