Gahnite Prehnite The largest crystal on this

The largest crystal on this specimen is one of the biggest Augelites that I have seen from Bolivia

it must be noted that the color of these crystals really stands out under fluorescent lighting and in sunlight as opposed to incandescent lighting

I have photographed the crystals under the microscope to better illustrate their quality

making it a pristine complete "floater"

but when you find a complete "floater" twin like this

Gahnite Prehnite The largest crystal on thisA rarely seen matrix Gahnite (a zinc bearing member of the Spinel Group) from Stratford in Alleghany County which was collected circa 1950s 1960s and comes from the collection of noted Italian author and mineral collector, Francesco Bedogn (#150). I've only seen one other specimen of this material, and this particular piece is bigger, with a better crystal on it. It features a sharp, well formed, very lustrous, slightly gemmy translucent deep blue